Monitoring Discrepancy Error - Input Group 1
Beckhoff · TwinSAFE Logic FB
What does FB MON Bit 0 mean?
A discrepancy has been detected between the channels of input group 1 in the FB MON function block. This means the redundant inputs are not switching in sync or are reporting different states, indicating a potential sensor fault, wiring issue, or incorrect timing that could compromise the monitoring function, leading to a safety stop.
Complete Troubleshooting Guide
- 1
Inspect the wiring for input group 1, ensuring both channels are correctly connected, free from damage, and properly terminated.
- 2
Verify the functionality of the input device(s) connected to group 1, checking both redundant outputs if applicable, for consistent operation.
- 3
Review the discrepancy time parameter for input group 1 in the FB MON configuration; adjust if the application legitimately has different timing requirements.
- 4
Monitor the individual input channels for group 1 in real-time using diagnostic tools to observe their switching behavior and identify which channel is deviating.