FB OPMODE Discrepancy Monitoring Error

What does FB OPMODE Bit 0 mean?

A discrepancy has been detected in the input signals monitored by the FB OPMODE function block. This usually means that dual-channel inputs (e.g., OpInX) are not switching or remaining in sync as expected, indicating a potential sensor failure, wiring issue, or timing problem. This will cause the FB to switch to an ERROR state, preventing mode selection.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Review the discrepancy time parameter for the FB OPMODE in the TwinSAFE configuration; adjust if the application legitimately has different timing requirements.

2. 4

   Monitor the individual input signals in real-time using diagnostic tools to observe their switching behavior and identify any channels out of sync.