Do I need custom Model?

I am a TestStand beginner working on a 10-year-old test system for discrete power transistors. These parts are very simple and are tested one at a time by an operator. Ten years ago, another engineer built a system using TestStand and several instruments connected by GPIB. Now the software needs to be rewritten since the old system is not compliant with test software version control requirements. The original designer made a complete custom Model file, and modified the snacmodelsupport2.dll with LabWindows CVI.
I am under cost and time constraints to finish this upgrade, and it appears to be a very large learning curve to understand this custom Model. I do not want to reinvent the wheel, but it seems to me that the stock sequential model is fine for this project. What is the rule of thumb as to when a custom model file is requred?
Solved!
Go to Solution.

In my opinion you should try to avoid customizing the Process Model. It makes it easier to maintain. It's even worse when you "need" to change modelsupport2.dll. UGH!!
The current sequential model has a whole bunch of callbacks which make it really easy to get desired behavior from your client sequence file.
Here's what I use for my rule of thumb for customizing the Process Model:
- Will this modification be useful to multiple projects?
- Does this modification make it easier all around in the long run. (i.e. less support, less maintenance, less work when creating new tests, etc..)
- Is my modification strong linked to 1 client sequence file? A process model should be something that can handle pretty much any sequence file. If you customize it such that it's linked to a single sequence file then you are probably doing something wrong.
- Does this modification make sense? In all reality what am I truly gaining by this modification?
A couple instances when I've changed the process model:
- Configuration Entry Sequences to change settings for a test. This just had a simple callback in it that I always overrode with my client sequence. It just put a menu item in the user interface so users could get to it.
- A callback/Configuration Entry which allowed users to link to a document describing what the test did. Again overridden by my test. Just used for the menu item.
- Disabling/Deleting an entry point. Test UUTs and Single Pass are the default for the sequential model. I only wanted users to select one.
Sounds like a crazy project. I hope it goes well for you.
Cheers,
jigg
CTA, CLA
teststandhelp.com
~Will work for kudos and/or BBQ~

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