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CompactLogix I/O Fault

2 posts in this topic

Hello,

Back in December 2017, we replaced a customer's PLC-5 control system with a CompactLogix.  Everything was working fine until about a month ago, when they started having an I/O fault, Code 16 - I/O module connection failed on required module.  At first it was showing up on multiple modules, and also the end cap.  However, after a few more faults, it was only showing up on module 2.  We replaced that module and the faults stopped for about a week and then returned.  The module we replaced is a 1769-IA16.

Any idea what may be causing this?  The customer insists nothing was done to the panel since the initial installation.  

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Unfortunately you are probably going to swap a lot of parts to find the culprit.  How many I/O modules are there?

One thing I ran into once that may be of help if module 2 continues to show the fault.  I had a system that kept getting a fault on a specific module and it turned out to be the outgoing connector in the module to the left.

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