Allen-Bradley PLC

Fault Code 139 (CompactLogix)

I/O module faults detected

Details

I/O module faults 139 on Allen-Bradley CompactLogix. Check controller diagnostics.

Error typefault
MeaningI/O module faults
Typical causesHardware fault configuration error communication fault system fault
SolutionsCheck CompactLogix diagnostic buffer verify hardware configuration review system logs refer to Allen-Bradley documentation
Severityhigh

Catalog references

Vendor Information

Allen-BradleyFault Code 139

Utilities

Troubleshooting Steps

Troubleshooting steps

Check CompactLogix diagnostic buffer verify hardware configuration review system logs refer to Allen-Bradley documentation

Other codes

Other Allen-Bradley PLC Codes

16 – Processor fault

Processor fault detected

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38 – I/O module fault

I/O module configuration fault

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77 – Communication fault

Communication fault with remote I/O

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20 – Remote I/O fault

Remote I/O communication fault

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21 – Communication timeout

Communication timeout with remote device

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FAQ

Common questions

What is CompactLogix?

Allen-Bradley CompactLogix is a PLC series. This fault is specific to CompactLogix systems.