Troubleshooting steps
Check PLC diagnostic files verify configuration review system status
Allen-Bradley PLC
20 – Remote I/O fault
Remote I/O communication fault
Details
Remote I/O communication fault. Check PLC diagnostics and configuration.
Error typefault
MeaningRemote I/O fault
Typical causesPLC fault communication fault configuration error
SolutionsCheck PLC diagnostic files verify configuration review system status
Severityhigh
Catalog references
Vendor Information
Allen-BradleyFault Code 20
Utilities
Troubleshooting Steps
Related
Related Allen-Bradley PLC Codes
FAQ
Common questions
Can I clear the fault?
Usually requires power cycle. Check diagnostic files first