Page Fault with Improper Use of FB_EPS

[ZLLentz]

Current Behavior

If you call fbEPS.setBit() or fbEPS.setDescription() prior to calling fbEPS() with some instance of DUT_EPS, it results in a page fault. This is because setBit and setDescription refer to the eps object that was passed in, and without passing one prior this is a null reference. Beckhoff sort of tries to warn us about this via a cryptic compiler warning, but this is otherwise not warned about in the documentation or in the docstrings.

Expected Behavior

We should have some combination of the following:

• Errors instead of page faults
• A warning in the docstrings
• A warning in the documentation

Context / environment

@NSLentz ran into this while testing out the EPS features.