FP CPU loses communication with modules

[wd8ivl]

Aaron,

You are correct about Fieldpoint and isolation being mis-understood.  I guess I was under the impression that the "C" terminal was common to the power source (backplane) that runs the circuitry in the modules and circuits that communicate that data to the FP processor.

What I was going for by having seperate 24V supplies for the FP-2010 and then all of the modules was keeping any electrical noise from the coils of the 24V relays tied to the DO-403 from getting back to the FP-2010. 

As far as the warning codes, it looks like I should be looking in the range of 33436 to 33488.  My thought would be to issue a reboot to the FP-2010 if I get warring in this range for 5 seconds.

Let me know what you think.

I'm on vacation for the next two weeks, so I'll respond when I get back.

Thanks for all of your help.

Mike        

[Aaron_G]

Mike,

Enjoy the vacation.

The C terminals for each IO module are the common terminals for the non-isolated (IO) portion of that module. The C terminals of the network module is the common for the backplane (isolated) and IO module control circuitry. Using the second power supply to isolate the network module and the IO modules was the correct way of going about it, however, you just need to go a little further and isolate all the modules that do not need power. You may find that in doing so the problem disappears. It may be the back-EMF from the relays is what is knocking the FP-AI-110 offline.

Regards,

Aaron