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I have a 1734-AENT/A Ethernet/IP Point I/O module and rather than checking the box that triggers a major fault on the processor if there's a communication fault, I want to monitor the communication status in the ladder logic and program the fault logic myself. However, I can't seem to find a way to monitor the communication status with the module itself.

There is a tag in the process called

(Module_Name):I.SlotStatusBits0_31 (DINT)

...but:

This only tells me the status of slots that are participating in the "rack optimized connection" and
Slot 0 (the I/O module) is always 1 and doesn't seem to indicate anything useful.

I was wondering, how can I reliably monitor the status of the module in the ladder logic?

flag	asked Feb 11 at 12:22 Scott Whitlock♦♦ 489●9

Gary F · Accepted Answer · 2010-02-19 01:33:36Z UTC

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How about using a GSV instruction with the class name module and the instance name pointing to the 1734-AENT module in the IO tree and the attribute fault code.

answered Feb 19 at 1:33

Gary F
191●3

Thanks Gary, that worked! Note that the destination tag size for the GSV instruction is INT. I ended up using the EntryStatus attribute rather than the FaultCode attribute, masking with only the top 4 bits (16#F000) and testing that it was equal to 16#4000 (Running). Worked like a charm. (Further ref: iqcontrols.com/Resources/Ref/…) – Scott Whitlock♦ Feb 19 at 13:14

Monitor the connection status of a 1734-AENT/A Point I/O module in ladder?

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