Troubleshooting steps
Check backplane connections reseat all modules verify wiring check module compatibility
Omron PLC
A9 – I/O bus error
I/O bus error
Details
Communication error detected on I/O bus.
Error typeerror
MeaningI/O bus error
Typical causesBackplane fault module not seated properly wiring issue
SolutionsCheck backplane connections reseat all modules verify wiring check module compatibility
Severityhigh
Catalog references
Vendor Information
OmronA9
Utilities
Troubleshooting Steps
Other codes
Other Omron PLC Codes
FAQ
Common questions
What is the I/O bus?
Physical bus connecting CPU to I/O modules. Faults affect all connected modules.
Community
Discussion & Experiences
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