Troubleshooting steps
Check I/O module status verify wiring check module addressing review I/O diagnostics
Siemens PLC
864A – I/O error
I/O module error detected
Details
I/O module error 864A. Check I/O modules and connections.
Error typeerror
MeaningI/O error
Typical causesI/O module fault wiring fault addressing error communication fault
SolutionsCheck I/O module status verify wiring check module addressing review I/O diagnostics
Severitymedium
Catalog references
Vendor Information
Siemens864A
Utilities
Troubleshooting Steps
Related
Related Siemens PLC Codes
FAQ
Common questions
Which module has the error?
Check diagnostic buffer or module status LEDs to identify the faulty I/O module