question stringlengths 19 6.88k | answer stringlengths 38 33.3k |
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Problem Statement: RGibbs in the model may make simulation slower than expected. What are the reasons behind these?
Description: RGibbs is the only reactor block where you do not require reaction stichometry. Without such detail reaction data, RGibbs can determine phase equilibrium by minimizing Gibbs free energy, subj... | Solution: 1) In Dynamics RGIBSS can be modeled as Instaneous or PFR. PFR-RGibbs additionally calculates response-delay and equipment-volume for given geometry data. It is a minimum effort to take account the holdup contribution, but it is not done in rigorous way. It is not recommended PFR configuration in RGibbs since... |
Problem Statement: In a larger pressure driven simulation only a portion of the model is anticipated to have reverse flow possible. In order to minimize the number of variables and equations for the problem, is it possible to setup only a section of a flowsheet for reverse flow? | Solution: No, all models use the GlobalRFlow parameter. There is no local parameter that overrides the global setting.
Keywords: Pressure driven
Reverse flow
References: None |
Problem Statement: Why do my PID Loops continuously report being Not Licensed?
Symptom: Aspen Watch Maker (Tools | Tag Maintenance | PID) shows Not licensed for all PID loops.
Cause: The TSK_PID1 task in InfoPlus.21 is the task responsible for checking out the PID collect licenses for the PID loops added in Aspen Watch... | Solution: Open the Services window on the Aspen Watch server and try changing the Log On As setting for the InfoPlus.21 Task Service to be a local administrator account (account used to install the software). Then Restart the Task Service and restart InfoPlus.21 database using InfoPlus.21 Manager.
Keywords: Aspen Watch... |
Problem Statement: What is the Aspen Cim-IO Interface Manager? | Solution: The Aspen Cim-IO Interface Manager provides an improved method of configuring Aspen Cim-IO Interfaces.
Here are a few tips for using the Aspen Cim-IO Interface Manager of creating an interface.
· Interface names of 10 characters or less are recommended.
· Aspen Cim-IO environment variables are... |
Problem Statement: The CIMIO_MSG.LOG is showing errors such as,
Could not create server xxx on node yyy on try number zzz, error is = Access is denied
 and the get records may display a Communication Failure in IO_DATA_STATUS_DESC | Solution: If you are connecting to your OPC server using a tunneler, make sure the correct server is selected in the Aspen InfoPlus.21 Administrator CIM-IO wizard tool.
In the OPC server select dialog, make sure you choose the tunneler server and NOT the actual node name of the OPC server.
Keywords: tunneler
OPC
comm... |
Problem Statement: Can the security and BPE profile specifications that are stored in the AFWDB Aspen Framework Database be transferred to other AFWDB Database Servers? This can help improve the rollout of configured Aspen Framework | Solution: s.
Solution
Yes. The AFWTools utility located in the Business Process Explorer installation directory can be used for this purpose. The AFWTools utility Export button on the Transfer AFWDB Data tab can be used to export AFWDB Profile, Role and Applications specifications to xml files. The xml files can be imp... |
Problem Statement: How can I plot the distillation curve showing the ASTM D86 temperature of a stream in Aspen Dynamics? | Solution: You can use flowsheet constraints for this purpose.
CONSTRAINTS
// Flowsheet variables and equations...
// Petroleum Properties - Propset Properties Interface - Class II procedures
VolPctSet as integerset ([1:9]);
VolPct(VolPctSet) as percent (fixed);
VolPct(1) : 0;
VolPct(2) : 5;
VolPct(3) : 10;
VolPct(4... |
Problem Statement: There are a number of problems when manipulating PID loops in Aspen Watch Maker. The problems include:
- problems when deleting PID records
- problems when going from fast scan to normal scan.
- unable to change IO device
- unable to change scan frequencies
- when scan frequency is changed, the chang... | Solution: Download the attached zip file.
Create a subdirectory under ...\AspenWatch\ called patches
e.g. c:\Program Files\Aspentech\AspenWatch\patches
and unzip the contents of this zip file into that directory.
Run the batch file.
The batch file will save a snapshot of the current state of your database, and will the... |
Problem Statement: Two issues are addressed with this patch:
Sometimes when the analysis doesn't complete in Aspen PID Watch, it is because of problems with Regional Settings. originally addressed in | Solution: 119711.
Also addressed in this new executable:
CQ00222647 Provide ability for user-defined scaling of limits on Raw Data plotSolution
The attached executable has been applied to Italian systems and resolved this problem. Stop / close any instances of the Aspen PID Watch application. This may work with other e... |
Problem Statement: When I run the attached simulation in Aspen Dynamics 2006, I see the sum of the mole fractions in the liquid outlet stream show strange values. This happens after the liquid feed is stopped (valve B5 is closed) and the tank gets only a gas feed (N2 in stream 1). In fact, the sum of the mole fractions... | Solution: Look at the level controller: you can see the level is dropping to zero at about 3.5 hr which is about the time you see the mole fraction sum to drop significantly from 1.
We are trying to take a liquid phase out of the flash drum, when there is actually no liquid phase present anymore. The liquid/vapor equil... |
Problem Statement: How can I monitor a remote CIM-IO server for important performance aspects such as CPU utilization, disk space, etc? Can I use the Health Monitor? | Solution: While it would be necessary to install Health Monitor in the remote server, this is not always a possibility or a preferredSolution. The attached SQL+ script makes use of the TYPEPERF command to probe a remote machine - in this example CIMIOSERVER - for its current CPU usage and save this information to an an... |
Problem Statement: Does the securable component enterpriseobjects.xml still exist? | Solution: Enterprise Objects hasn't been delivered since Aspen Framework 2.6. Enterprise Objects is no longer in active development.
Keywords: local
security
References: None |
Problem Statement: When attempting to start the Aspen CIM-IO Manager Windows service the process fails and an error dialog box appears:
Windows could not start the Aspen Cim-IO Manager service on Local Computer.
Error 1053: The service did not respond to the start or control request in a timely fashion.
There are few... | Solution: 1. One of the first things that the CIM-IO Manager Service does is to parse the Windows services file, looking for the port entry for the service labelled CIMIOManager. Test whether this file is causing the problem:
First back-up the existing services file:
C:\Windows\System32\drivers\etc\services
Then modify... |
Problem Statement: When seeing error 55 no buffer space available in the cimio_msg.log file or if experiencing a drop of data on VMS with UCX machines, set the number of large buffers to a bigger value. | Solution: If you do a show communication command from the UCX prompt, part of what you get back looks like this (the values will be different)
Type: Ethernet
Free
Maximum
Max Bytes
Minimum Min
Bytes
Large buffers
20
200
377600
10
18880
Small buffers
150
1000
256000
50
12800
In order to fix the problem you may have to ... |
Problem Statement: When installing the CIM-IO core on a Sun Unix system, running cimio_install returns an error cimio_install : not found | Solution: The problem is caused by extraneous control characters (carriage control, line feed) at the end of each line. Remove them and the procedure will run correctly. This problem has been reported to development and will be fixed in a future release.
Keywords: sun
unix
installation
line-feed
carriage-return
Referen... |
Problem Statement: When the network connection between the CIM-IO Server and CIM-IO Client nodes is broken, a problem can occur where the CIM-IO connection doesn't re-establish itself for a long period of time - even after the network connection has been restored.
Several tests have shown that when Store&Forward is NOT... | Solution: To resolve this behavior, install Engineering Release CI010712A.NTI. This ER can be downloaded from the support website as Knowledge Base Document ID 105717.
Keywords: errno=38
References: None |
Problem Statement: Before v9.0, it was impossible to use Aspen Cim-IO Interface Manager to set <TIMEOUT> <DEVICE> <MSGS>< NOTAGINFO> arguments on the Cim-IO Store & Forward (S&F) processes. This | Solution: describes how to use the enhanced v9.0 Cim-IO Interface Manager to set additional parameters for the S&F processes.Solution
Starting with v9.0, you can use Aspen Cim-IO Interface Manager to set startup arguments on the Cim-IO Store & Forward processes. Refer to Chapter 11 of the Cim-IO User Guide or Knowledge... |
Problem Statement: Problem in PID Watch configuration for Yokogawa Centum XL DCS
There is a need to modify the existing Yokogawa Centum CS configuration files to pick up the proper MODE from EXAOPC. | Solution: For the simplest interim Centum XLSolution, the following is recommended:
1. Make a backup copy of the AW_PIDC_CUSTOM2.cfg file in the %ASPENWATCH%\etc\sql\Pid folder (for example: rename as AW_PIDC_CUSTOM2.cfg.bck and AWP_PIDC_CUSTOM.sql.bck to save the original files)
2. Copy the existing AW_PIDC_CENTUM... |
Problem Statement: USERACM reactions are created in Aspen Custom Modeler using the Aspen Reaction Toolkit framework. The reaction kinetics is implemented in a few models, which can be created using the Reaction Wizard. Once the code is completed, the model can be exported in a similar way to the Model Export feature, t... | Solution: Yes, this is possible. See the attached examples which illustrate the steps required for RCSTR and for RPLUG models.
We assume the reader is familiar with Aspen Custom Modeler (including the Aspen Reaction Toolkit and Model Export features), Aspen Plus and Aspen Dynamics. The note is written for version 2006.... |
Problem Statement: What value should I enter for the internal diameter of the bed if an internal heat exchanger is present in the bed? Do I need to add a correction? | Solution: You should enter the actual diameter of the adsorbent layer. There are two ways that the program uses the diameter of the bed: to calculate the external area of the bed for heat transfer to the environment, and to calculate the cross-sectional area of the bed to determine the relationship between flow rate an... |
Problem Statement: What are the manipulated variables for controllers automatically added by Aspen Plus during the process of exporting to dynamics? | Solution: This is usually block specific, and dependent on whether it is flow-driven or pressure-driven.
However the rules of thumb is that if the model is flow-driven, then the manipulated variables would be various flow rates; if the model is pressure-driven then the manipulated variables would be valve positions whe... |
Problem Statement: What do you mean by the quality in pressure safety valve model results? | Solution: In all relief valve models available in Aspen Plus Dynamics, QUALITY is defined as:
(1) PSV, PSV2, BURSTINGDISC, ORIFICE, and TVALVE
Quality_in = vf * mw (vapor) / Mw
Quality_out = vfo * mw(Vapor Outlet) / Mw
MW - Overall Molecular Weight
vf: Vapor Fraction
(2) DELTAP
Quality_in = vf_in * mw (Vapor in... |
Problem Statement: Rgibbs Does Not Support CSTR Option | Solution: In earlier releases Rgibbs supported the CSTR option. As with Rstoic and Ryield this option was modeled by mixing the feed streams into a dynamic vessel, the mixed output of the vessel was then fed into an instantaneous adiabatic reactor. The CSTR option has been withdrawn from Rgibbs at 2006.
If you wish to ... |
Problem Statement: Why does the multiply block in the control signals library show significantly greater values on the output when the input is used to calculate the output according to the following formula:
Input1*Input2=Output. | Solution: When using the multiply block it is not really a straightforward controller as it may appear. From the outset it looks as if the calculation is Input1*Input2=Output. But its not that simplistic, this model uses scale factors to adjust the units of the variable to work within metric units in the background tha... |
Problem Statement: When using an ACM model exported from Aspen Plus do you need an ACM license in order to run the model? | Solution: An ACM license is not required to run an ACM model that has been exported from Aspen Plus. However, if you want to modify the model then you will have to enable Custom Modeling from the Tools menu. Then, the ACM model will appear in the Custom Modeling folder where it can be modified. Modifying the model will... |
Problem Statement: When exporting an Aspen Plus simulation to Aspen Dynamics, there is a choice of a Flow Driven simulation and a Pressure Driven simulation. Which one should I choose? | Solution: In an Aspen Plus steady-state simulation, the outlet stream pressures and flow rates of a block are determined from the inlet conditions to the block, and the specifications for the block. Neither the outlet stream pressures or flow rates are affected by the pressure in the downstream blocks. This approach is... |
Problem Statement: How do I reduce the size of a *.dpp file? | Solution: When a user does a 'save-as' on a large *.dpp file, it should get smaller. In fact, it is a best practices to do a 'save-as' periodically. When DMCpus Model needs more space, it grabs more space, but as existing memory is freed up, Model cannot always take advantage of that freed up space. Doing a 'save-as' w... |
Problem Statement: How can I activate the PID Group Configuration on the Aspen APC Web interface ? | Solution: In order to activate the PID Group Configuration on the Aspen APC Web interface, it is possible har dcode the variable in the AWPIDGroupConfig.asp file to true.
Comment out the following line and hard code the value to true.
var userCanRun = (1 == Session(NewWebProvider) ? Session(WebMgr).CanManage : Sess... |
Problem Statement: Run-time error ' 521' Can't open Clipboard. Uncertainty graphs either don't open or the program is closed immediately. | Solution: Close any Microsoft desktop tools that may be using Clipboard, retry Aspen Desktop application.
Keywords:
References: None |
Problem Statement: How can I permanently disable the Aspen Simulation Workbook (ASW) (Design and Run) toolbars so that they will not re-load when I start Microsoft Excel? | Solution: To permanently disable the Aspen Simulation Workbook toolbars please follow the procedure below:
1. Open the Microsoft Excel
2. From the main menu bar, click on Tools | COM Add-Ins...
3. De-activate the checkbox beside the Aspen Simulation Workbook 200X.X and click OK
If you don't see the COM Add-Ins... opt... |
Problem Statement: How to Access to DEP prediction or estimate for intermittent variables? | Solution: The current prediction is not available in the parameter list for intermittent variables but you can calculate it by taking the DEP and adding the PREDER to it.
Since PREDER = Prediction ? Actual.
If you have a long time to steady state the PDEPC001 and PFMDEP001 is a good estimate of the current PRED with... |
Problem Statement: Which offline Advanced Process Controll (APC) applications use the APC_Builder license key? | Solution: The Aspen APC offline tools used to check out different license keys when used along with the old licensing model (Perpetual). However, under new Token license agreements (starting July 2009), the offline license keys have been consolidated into a single license key called APC_Builder. Listed below are the ap... |
Problem Statement: How to disable the Open Simulation Environment (OSE) Workbook from Excel after it has been installed. | Solution: .
There are known performance issues when starting Excel when OSE workbook is installed. This is largely due to the .NET runtime being loaded into excel.
Option 1
To disable the Aspen OSE Workbook 2004.1, use the following procedure:
1. Select View | Toolbars and switch on the Visual Basic toolbar.
2. Selec... |
Problem Statement: What might prevent the PID Tuning (or Model Identification) window from opening or from returning an error message? | Solution: One possible reason for the windows to not show up could be that the window was off the visible screen area due to disparity in screen reSolution. By default, the PID Watch dialogs are opened in the center of the display, but the Top and Left pixel positions are saved when the dialog is closed - so the window... |
Problem Statement: I have an AspenWatch installation, which is working correctly with the only problem that it is not possible to define PID groups. Everything into the Group Configuration page in PCWS is greyed out. | Solution: It's greyed out because the user does not have Manage or Engineer Change permissions defined in the Security page for the web server host.
Visit the Configuration page of the web server, go to Security and expose the WebServer in the Host selection box. Then look at the Users and Roles and Permissions, and co... |
Problem Statement: What do different scan periods time scan in PID configuration in AspenWatch mean? | Solution: During the import of PID loop in AspenWatch, a fast scan rate, a normal scan rate and a medium scan rate are required.
The normal and fast scan rate work together to determine when those loops are scanned. Any loop can be put into either Normal or Fast scan using the tag maintenance in AspeWatch maker.
Duri... |
Problem Statement: How can a .clc formatted data file be imported into PIDWatch? | Solution: Currently there is no interface for selecting the appropriate PV, SP, OP inputs from the CLC file
Alternate method to retrieve data for PID Watch from a DMCplus CLC file:
DMCplus Model
1. Import CLC file into DMCplus Model
2. Select (highlight) the appropriate vectors in the List of All Vectors view
... |
Problem Statement: How to check the number of tags that can be accessed in Aspen PID watch Performance monitor?
Or
Why can't I view all the PID tags configured in Aspen InfoPlus21, using Aspen PID watch Performance monitor? | Solution: It is possible that all the PID tags configured in Aspen InfoPlus21 could not be accessed through Aspen PID watch performance monitor. The reason could be that the maximum number of tags mentioned in Aspen Watch is not set correctly.
To modify the number of tags for PID watch, using Aspen Watch monitor,
1. Op... |
Problem Statement: PIDWatch only allows me to select out of the first 100 tags from the AW database, is this configurable? | Solution: Yes, the configuration of how many tags are visible from the Aspen Watch database is available under the Tools and then Options. There is input for Max Tags, 100 is default.
Keywords: Aspen Watch, PID Watch, tags
References: None |
Problem Statement: How do I prevent a validation error when adding a new CV a non existing sub controller appears in the ccf?
When adding a new variable to a CCF file it adds a sub controller that does not exist in the configuration file thus creating a validation error. If you try to delete this sub controller the act... | Solution: This problem comes when there is a mismatch in the name of the sub controller defined in the template file and the ccf file. To avoid this problem perform either one of the following options:
1. Edit the template (*.TCC) in DMCplus Build so that it contain a valid sub controller that matches your CCF file... |
Problem Statement: What causes SmartStep to make impulse like steps on MVs instead of the typical steps? | Solution: SmartStep if configured correctly, should results in steps in the MV setpoints. However, an incorrectly configured SmartStep controller can result in the behavior mentioned in the problem statement. Such behavior are typically seen if the SmartStep parameters for the controller are not configured correctly. F... |
Problem Statement: Running Aspen HYSYS Optimizer from Aspen Simulation Workbook | Solution: A function ASWHysysStartOptimizer() has been added in ASW V7.1. This can be linked to a command button in Excel spreadsheet. A screenshot of the Excel spreadsheet with the command button is given below.
The code linked with the command button is given below.
Private Sub CommandButton1_Click()
Call ASWHysysSta... |
Problem Statement: By default, Aspen Simulation Workbook (ASW) does not allow you to change an Aspen HYSYS Adjustable variable. | Solution: HYSYS variables whose modify state is Adjustable are calculated by HYSYS but also can be modified by users. An example of an Adjustable variable is a HYSYS worksheet variable. If you add an Adjustable variable to ASW, then by default it will be given an ASW variable status of Default and it will be set to rea... |
Problem Statement: Technical tips for configuring and troubleshooting PIDwatch through Production Control Web Server | Solution: The suggestions ofSolution 122691 “Technical tips for configuring and troubleshooting PIDwatch through Production Control Web Server” points still applies to the newer versions with some changes on the components, services and paths.
The six points mentioned on thatSolution should be followed
1. If upgrading ... |
Problem Statement: Getting an error when trying to connect Aspen Simulation Workbook (ASW) with HYSYS simulation case Failed to connect to Simulation. | Solution: This error in particularly comes up if you have multiple versions of HYSYS installed on your machine and the simulation is created using HYSYS 2006 or 2006.5 or higher version. The user will have two options to successfully connect the simulation to ASW.
1. From the windows Start menu go to Programs | AspenTe... |
Problem Statement: How can I import the flowsheet diagram from Aspen Plus or Aspen HYSYS into Aspen Simulation Workbook and be able to modify the units individually? | Solution: Aspen Simulation is a software that allows the user to link Aspen Plus or Aspen HYSYS to Excel in such a way that the process specifications and results are transferred instantaneously. However, there is not a direct way to import the process flowsheet diagram.
The general way to build the flowsheet in Excel ... |
Problem Statement: How can I change the liquid holdup in a packing when using the simple packing hydraulics option in RadFrac? | Solution: The liquid holdup is related to the liquid flowrate with the following equation (in Stage model):
rhol * Vl * stagearea = K_pack * LiqOut.F * V
where:
rhol: liquid molar density (kmol/m3)
Vl: stage liquid volume (m3)
stagearea: column cross section (m2)
K_pack: packing constant
LiqOut.F : liquid flowrate leav... |
Problem Statement: Default Performance Curve in Turbine (COMPR) | Solution: Aspen Plus Dynamics now supports a default performance curve for the turbine to give a more realistic dynamic simulation. If you did not enter performance and efficiency curves in Aspen Plus, then the curve Head vs. suction volumetric flow rate and Efficiency vs. suction volumetric flow rate for a turbine are... |
Problem Statement: When an ACM model that has been exported to run in Aspen Plus is then exported to Aspen Plus Dynamics, where do you find the model in Aspen Plus Dynamics? | Solution: All of the Aspen Plus Dynamics models can be found in the Dynamics library in the Exploring - Simulation window. However, an ACM based models exported from Aspen Plus will be found in the Local Library folder
In this example, the model new_heater is an ACM model used in the Aspen Plus simulation that was ... |
Problem Statement: Token Licensing: how is Aspen PID Watch Performance Monitor licensed? | Solution: Token consumption of Aspen PID Watch Performance Monitor (formerly called Aspen PID Watch) is based on the number of PID Loops, i.e. the number of existing PID loop records. You can configure a PID loop to be collected and analyzed from within Aspen Watch Maker. The token consumption is written in your contra... |
Problem Statement: Built-in function @POW sometime causes Floating point error: INVALID Program will halt | Solution: The base value of @POW function has to be >=0. Addition of @abs function to the base value(or equation will prevent the Floating point error : INVALID Program will halt .
ex. @POW (@abs(base), exponent).
Keywords: Built-in function
@POW
References: None |
Problem Statement: In versions 2004.1 and older of Aspen Dynamics there was an Outlet_Relief port on FLASH2 blocks that allowed a Material Stream connection for a Pressure Relief Device. In version 2006, the port is labeled OBSOLETE - DO NOT USE. How do you connect a stream to a Flash2 block for a pressure relief evalu... | Solution: For 2006, the FLASH2 vessel model was improved to provide many of the features that are included in the RCSTR model. As part of that upgrade, the ports configuration was changed and the Outlet_Relief port removed. The Out_V and Out_L ports now allow multiple connections where relief devices can be connected. ... |
Problem Statement: What is the procedure to modify a custom DCS type for PID in AspenWatch? | Solution: To edit the custom DCS type for PID loops in AspenWatch.A Follow the help file on AspenWatch maker, under the section set up PID loops and miscellaneous tags>Custom DCS types for PID monitoring.
A? Edit the AW_PIDC_CUSTOMX.CFG where X is 1,2, or 3.A The file is located in programdata\Aspentech\APC\P... |
Problem Statement: How to improve the speed of Aspen Dynamics calculation? | Solution: Performance is often limited by the size of the largest group of simultaneous equations.
1. Simulations with recycles result in large groups of equations incorporating all blocks and streams within the recycle. Recycles needs to solve for temperature, pressure, flow and composition for each component.... |
Problem Statement: Can I mode transient pipe delay in Aspen Plus Dynamics ( APD)? | Solution: One should be able to model piping delay by choosingSolution method constant dPdL. However, the delay behavior in the Pipe using this option is limited and following are the pointer needed to keep in mind:
- Delay behaviors are designed only for Composition and Enthalpy (temperature)
- Flow rate is not to be... |
Problem Statement: How to increase the display time for plots of the dynamics simulation run?
Description: In Aspen Plus dynamics, If the simulation runs for long time, previous plot display data is continuously truncated. | Solution: If the result are continuously truncated for a given plot, previous simulation results can be loaded by following the steps below.
Select the object on the PFD (may be stream)
Right click to select the Form ll Select Plot (may be TPFm Plot)
In the Plot view, right click again and go to Properties
From Propert... |
Problem Statement: When I import a type library into my current Aspen Plus Dynamics simulation, I get a message that my variable types may be overridden. What does that mean? | Solution: This message You have changed the unit of measurement for individual variables. Do you want to override these changes? occurs when you import the new library into an existing flowsheet where you have changed the units of measurement for some of the variables displayed in forms and tables.
If you choose Yes to... |
Problem Statement: PIDIncr Model Supports Vendor Specific Control Algorithms | Solution: Aspen Plus Dynamics now supports some of the key industrial vendors' PID algorithms. The implementation has been given to PIDIncr model within ControlModels. This means the same tuning parameters used in the model can be used directly with the actual controllers (and visa versa). As the model is using the doc... |
Problem Statement: How to change the gas compressibility factor in Aspen Adsorption | Solution: Gas compressibility factor can only be tracked via Global model for the entire adsorption flowsheet.
By default, gas compressibility is set at “Fixed Compressibility” with a value of 1.
To change this value, go to Explorer > Global > AllGlobals > Z_Global
.
For User Procedure Compressibility option: Z is supp... |
Problem Statement: What is necessary to migrate Aspen Adsim from one version to a newer version? | Solution: If using Aspen Plus/Properties Plus the .appdf will need to be regenerated. The user will need to open the .bkp file they created in Aspen Plus in Aspen Plus 11.1 (if they only have the .apw they will need to go back to Aspen Plus 10.2, open the .apw and then save a .bkp). Re-run the simulation in Aspen Plus ... |
Problem Statement: Customer is getting the following error when attempting to install ADSIM from AES 10.2 Update 1 CD on Windows 98/95 systems;
Error in File F:\AspenADSIM\prop.ini [Aspin ADSIM STANDARD] Validation:
Feature ID ASPEN ADSIM STANDARD is not unique
This only happens on Windows 98 and 95 machines. It works ... | Solution: Copy the entire contents of the AES 10.2 Update 1 installation CD onto your Hard Drive.
Replace \AspenADSIM\prop.ini file with the attached version.
Install the product from the Hard Drive by clicking the setup.exe file.
Keywords: ADSIM
Prop
AES 10.2
References: None |
Problem Statement: What are the functionality of various integrator tabs in solver options? | Solution: 1.1 Integration Method
There are four integration methods used in Aspen Plus Dynamics. Integrators are chosen based on the type of model and the objective functions of the run. The selection of this method is a
balance between the speed of simulation and the degree of accuracy of the results. The Figure 1.1 s... |
Problem Statement: Best Practices to handle Electrolytes model in dynamics | Solution: Following are the tips, one may consider to handle convergence issue in dynamics:
1) If possible use apparent method. Since electrolyte systems are non-ideal, you may need to switch from the default of local properties calculations to full rigorous property calculations.
2) If you do not need to handle salt o... |
Problem Statement: s
What is the loading for IO scanning for miscellaneous and PID data in AspenWatch? | Solution: Once the miscellaneous and PID data are added in AspenWatch maker, the application created IOget records in Infoplus.21 database. We can take a look at these records using Infoplus.21 Administrator to determine the IO scaning for these records.
-Go to Start>All Programs>AspenTech>Aspen Manufacturing Suite>Aps... |
Problem Statement: Where can I find the RadFrac model in the Aspen Plus Dynamics Model Libraries toolbar? | Solution: RadFrac is too complex a model to be created and converged within Aspen Plus Dynamics. For this reason we exclude the RadFrac model from the Model Libraries toolbar.
The complex nature of the model needs to be solved using the Aspen Plus Sequential ModularSolution method. The results can then be used to initi... |
Problem Statement: Many of the normal stream properties like viscosity are needed for process monitoring or control. The normal stream results or stream sensor does not provide this additional information. Is it possible to calculate these additional properties and then use them as input to process control schemes? | Solution: Additional properties can be calculated using property procedures. A list of the available property procedures can be found in the Aspen Plus Dynamics on-line Help (Aspen Custom Modeler Contents) under Library
Keywords: Stream properties
Property procedures
References: | Property Procedures. One of the proper... |
Problem Statement: How to Embed Simulation case in Aspen Simulation Workbook | Solution: Embed feature will keep the simulation case file along with the excel file. So whenever user forward the ASW excel file, it will contain the simulation case file.
To embed the simulation case files:
1 Open the ASW Organizer; select the Configuration | Simulations view.
2 Select the simulation case to be emb... |
Problem Statement: APC Builder reinsall fails after installing its cumulative patch.
And, got following error message.
1311 Source file not found E:\aspenONEV7.2DVD2\ams\aspenonev7.2dvd2\Aspen APC Builder\GLE28E~1.cab. verify that the file exists and that you can access | Solution: The root cause for error
1311 Source file not found E:\aspenONEV7.2DVD2\ams\aspenonev7.2dvd2\Aspen APC Builder\GLE28E~1.cab. verify that the file exists and that you can access
is because this missing component is newly added in patch, so when you use RTM DVD to re-install(repair) it can't find the compon... |
Problem Statement: When a Process Model has been identified, why does it appear that the PID-Watch Expert parameters are not working? | Solution: When setting the Expert parameters take care that the desired value is properly registered in the box (the value selection works better if you move slowly the slider).
For example, the Beta parameter is showing 69 in the box even if the slider is 12.
Double click the slider selector to adjust it to the righ... |
Problem Statement: Dynamic models with pipes could be a challenge to tune up. | Solution: Here are some general tune up tips to help with pipe model trouble shooting:
1. In pipe model, the first node and the end node boundary conditions are being swapped based upon the flow direction, but they swap independently. This is generally good approach to handling pipe in rigorous manner. However, it ma... |
Problem Statement: New 'Cycle option for TimeData model | Solution: The option enable the model to repeatedly cycle through the data. To activate, set Cycle to Yes on the configure form.
See attached model file to check the cycling data output from the TimeData block.
Keywords: TimeData, Cycle, Cycling
References: None |
Problem Statement: Is there a sample to show column shutdown? | Solution: Run the attached model and let it fully running and then simply change feed controller to be manual and fill in its OP to be zero, then observe that all the flows of the column come to zero eventually.
Note: The model file is taken fromSolution 115731
Keywords: shut down, shut
References: None |
Problem Statement: Why are variables unable to be removed or added when running MQA cases for Adaptive Modeling? | Solution: When setting up a MQA case on PCWS, the list of Independents and Dependents variable are set and can not be changed.  The Add and remove variables are grey out along with the time to SS and Max model order.
This is by design as the MQA utilizes the whole model structure to run its analysis. However you c... |
Problem Statement: Why do I get Error (-1) saving CCF to disk, while saving a controller configuration file (CCF) using Aspen DMCplus builder when selecting the option to not validate using DMCplus Simulate? | Solution: This error is related to permission of the folder C:\ProgramData\AspenTech\APC\Online\app\controller folder, where the CCF is always placed for loading a DMC plus controller online. The ProgramData directory in Windows requires that the user writing to this directory has Administrator privileges.
Hence, if yo... |
Problem Statement: Is it possible to import an existing DMCplus Model DPP file into APC Builder? | Solution: Currently there is no direct way of importing a DMCPlus Model project file (.dpp) into an APC builder project. Here is a list of recommended steps for converting a DMCPlus project file into a APC builder project.
1. Export items from a .dpp file and then import them into a APC builder project. The follo... |
Problem Statement: What are the common log files associated with APC Builder controllers? | Solution: There are mainly four location where error logs are stored for APC Builder applications that are running online-
1. On Web Server, Repository Errors.log: Located in the folder C:\ProgramData\AspenTech\APC\Web Server, this file logs all messages related to the controller application on the Web Server. Ex.: Dep... |
Problem Statement: Possible range of values for DEPSTA and INDSTA are different in APC Builder compared to DMCplus. | Solution: Engineers need to keep this difference in mind while reviewing the calculation for an application converted from DMCplus to APC Builder. The following table lists the possible numeric values for the status parameter of dependent and independent variables in the controller and the difference between how the n... |
Problem Statement: Why do I get an Overwrite formulas Warning Message in HYSYS with Aspen Simulation Workbook (ASW)? | Solution: When accessing HYSYS variables whose calculate state is adjustable in ASW, sometimes you can receive warning messages asking if you want to overwrite formulas with constant values. The ASW variable status of these variables is shown as Default. These variables are calculated but can also be modified by users.... |
Problem Statement: What can cause the error DMCINI Failed - 50 and how to solve it? | Solution: When the internal validation fails it gives you the “DMCINI Failed -50” error. This error will appear when you try to load a ccf or when you save your ccf and validate it with DMCplus simulate.
There are several causes for this problem, please review your ccf in order to avoid them.
1. If you have input/o... |
Problem Statement: FAQs on using AspenOTS as an OPC server for a virtual Hysys simulation and connecting it to DMCplus. | Solution: What is the procedure to setup an OPC server for a virtual plant Hysys simulation?
You will first need to set up the tags in the OTS application using the HYSYS model that you are working with. You can follow the steps listed inSolution ID- 128009 to add the tags to the OTS application. Once you finish adding... |
Problem Statement: How can I turn on the column grouping feature in the Variable Organizer? | Solution: To turn on the column grouping feature, right click on a column name in Variable Organizer and select the Group Box option. This will make the column grouping box visible. You can then drop columns headings into the box to group your data by those columns.
Keywords: None
References: None |
Problem Statement: Before v7.1, to model detailed column overhead, one had to do it in Aspen Plus first and then export to Aspen Dynamics. | Solution: Since v7.1, Aspen Plus Dynamics.can automatically reconfigure a Radfrac column with a condenser into an external condenser.
Key benefits of an external condenser
1. Allows detailed modeling of the overhead system without having to configure it in Aspen Plus (which may be difficult to converge). Use only the ... |
Problem Statement: Tips on how to properly set up Subspace ID to get best model. | Solution: - Keep the case small. Include similar dynamics CVs and relevant MVs only. The 'kitchen sink' approach will not work here. Set up a larger case and run it as FIR ID to get a rough idea of what the model is going to be.
- Add .PV of the MVs (assuming you are moving the .SP) will help ID the other CVs in the ca... |
Problem Statement: What does the following error message mean : a??Entry name: is invalid for one of the following reasons: a) it conflicts with a reserved entry name, b) it is not allowed in this section, c) it is already in use by another entry Please select another namea??? | Solution: This warning message appears in V7.3 CP4 and V8.0 when an Entry offends one of the three mentioned conditions.
Some examples:
If a new Entry in the Independent Section is named as ETMV (with the External Targets disable) the error message will appear. In this case the condition a) it conflicts with a reserved... |
Problem Statement: What is the proper technique to identify the model response curves of an intermittent signal? | Solution: Intermittent variable is any measurement that does not have continuous measurements (every collection cycle). The most common example of an intermittent variable is an analyzer reading. Raw values of intermittent variable should not be used directly in model identification because it may lead to model error... |
Problem Statement: What is a Pseudo ramp variable and its example with respect to DMC plus controller? | Solution: A Pseudo Ramp variable is that process variable which has either very long (10-12 hours) or very short (<30 minutes) Time to Steady State (TTSS).
These variables, due to a gross difference in dynamics w.r.t other variables, will be modeled & controlled as a ramp variable in Aspen DMC plus system.
It is Pseudo... |
Problem Statement: What is the significance of selecting Time to Steady State in case parameters, while creating a controller model using Aspen DMCplus Model package? How do I judge whether the selected Time to Steady State is correct or not? | Solution: Time to steady state (TTSS) is the time in which Control Variable (CV) reaches to steady state, after one unit movement of the Manipulated Variable (MV). In other words, it can be said that this is the time in which the whole process/system settles down, once after there is a change in MV.
While creating a co... |
Problem Statement: When you have multiple ASW versions installed on your computer, it could on certain occasions generate some incompatibility issues between the Add-in that is installed in Microsoft Excel. This is especially so when trying to create macros and link path commands to work in a created workbook. | Solution: In order to avoid this issue, follow the procedure suggested below:
1) Remove the entire list of ASW Add-in versions running Excel using Administrator rights.
2) Once the program is running, under File | Options | Add-ins | Manage | COM Add-ins, click on ‘Go…’ and select from the list all the ASW Add-... |
Problem Statement: What are the possible source of model errors during model Identification? | Solution: During the model identification process, there are two types of model errors:
- Variance errors
· caused by noises and unmeasured disturbances in the test data set
· these errors can be reduced or eliminated by adding more step test data of high quality (high Signal/Noise Ratio) to the d... |
Problem Statement: How to troubleshoot Installation and Run Time issues with Open Simulation Environment (OSE) Workbook? | Solution: Installation Issues
ProblemSolution / Notes
After installing Aspen OSE Workbook, the OSE Workbook toolbars do not appear in Excel.
The toolbars may be inactive. In Excel, select View | Toolbars to see a list of the toolbars. Check the Aspen OSE Workbook Design and Aspen OSE Workbook Run toolbars to make them ... |
Problem Statement: I have linked Aspen Simulation Workbook to HYSYS Dynamics. How do get excel to update the profile table once the HYSYS Dynamic run has completed? | Solution: In order to update excel profile during the dynamic run ASW will pause the Dynamic integrator to collect data from HYSYS and then resume the run. Further information into the frequency at which ASW updates the profile table is provided in knowledge baseSolution 144075.
If you want the dynamic simulation to r... |
Problem Statement: How do I select which version of Aspen HYSYS to use with Aspen Simulation Workbook (ASW)? I have multiple versions of Aspen HYSYS in my PC and I would like to select a particular HYSYS version for ASW. | Solution: From Aspen Simulation Workbook, one can control the HYSYS version to be launched.
Please go to the Aspen ASW Add-in in Excel and open the Organizer; then go to Configuration | Simulations. From Version Option in the pane on the right, it is possible to specify (please see the screenshot below):
A? a??... |
Problem Statement: How do you toggle between Aspen HYSYS column specs within Aspen Simulation Workbook (ASW)? | Solution: To toggle between the specs in the column within ASW you have to first bring the specs into the ASW organizer and create a table with in the excel.
Please see below steps for the details:
1. Highlight the Specified Value, Current Value, Wt. Error, Active and Estimate variables in the column monitor page by ho... |
Problem Statement: How to turn off test group in a controller running in Calibrate mode? | Solution: Test Group in Aspen DMC3 controllers represent an handle the user could use to specify whether the variables (belonging to a particular Test Group) should be included in the optimization and control problem or in the Step Testing problem. The system does not allow user to turn OFF a test group (remove variabl... |
Problem Statement: An error is returned when using the type-ahead tag search on the OEE chart page. However, if the tag search for OEE tags is performed on the common Search page, it returns all configured OEE tags. The tags can then be successfully returned to plot and the OEE plot will open.
Search error: make su... | Solution: The full-screen search page has a different configuration file for defining the search engine connection information than aspenONE Process Explorer page.Â
AtWebPlotsConfig.xml under ProcessExplorer/WebControls defines this information:Â localhost can be used here if Tomcat for the Search Engine is installed... |
Problem Statement: In Aspen Simulation Workbook (ASW) how can I change the dynamics update frequency? | Solution: In ASW the user can change the dynamic update frequency through the
Organizer|Configuration|Simulations|Dynamics update frequency. A screenshot showing this parameter is shown below:
By default ASW will update after each time step that is entered through the Aspen HYSYS Dynamic Integrator. The user is able to... |
Problem Statement: What are OEE_QUANTITY_UNITS, OEE_UPDATE_PERIOD, and the target and limit fields used for? | Solution: The OEE_QUANTITY_UNITS, OEE_UPDATE_PERIOD, and the target and limit fields are not used by the current version of the application at all.
· The OEE_QUANTITY_UNITS field is just for reference to record what units the Actual and Target is being measured in.
· The OEE_UPDATE_PERIOD field is meant... |
Problem Statement: When using the Aspen Properties Excel add-in there are problems working with vertical ranges. I can use the add-in to make operations when components are arranged horizontally but not vertically. | Solution: This error can happen after a security update for Windows is applied to your system. ThisSolution applies only if you have installed the update 3006226 from the MS14-064 Security update for Windows OLE: November 11, 2014.
This security update has a known issue with array functions not working after being inst... |
Problem Statement: How do I link Aspen HYSYS to the Aspen Simulation Workbook? | Solution: There are two ways that you can link Aspen HYSYS to the Aspen Simulation Workbook.
Method 1
Click the Enable button . The Aspen Simulation Workbook will appear.
Click the Organizer button . The Aspen OSE Workbook Organizer will appear.
Open Aspen HYSYS and load in your case.
While in Aspen HYSYS navigate to s... |
Problem Statement: How to resolve the issue of Adaptive modeling case reports not being displayed? Sometimes, Adaptive modeling case reports are not fully displayed in any other system but in the Aspen Watch box. | Solution: This issue is solved by adding PCWS site to the Local intranet zone, or enabling compatibility view in IE.
The URL in IE determines the zone the site is running in. We normally recommend to add the PCWS site to the Local Intranet zone on the web client. Compatibility view normally sets the option to display l... |
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