Two-Hand Discrepancy Error - Between Pairs (Safe Inputs Active)

What does FB TWOHAND Bit 10 mean?

Similar to 'FB TWOHAND Bit 2', but specifically when the 'Safe Inputs after Disc Error' option is active for the discrepancy between input pairs. This means a timing discrepancy occurred between the two-hand input pairs, and despite the FB's attempt to maintain a safe state, the error persists, indicating a critical violation of the simultaneous actuation requirement, stopping the machine.

• Substantial difference in operator actuation speed between input pair 1 and input pair 2.
• One two-hand button assembly has significantly slower response time than the other due to mechanical wear or internal damage.
• Incorrectly configured 'TwoHandDiscrepancyTime' or 'BetweenPairDiscrepancyTime' parameters in the safety controller.
• Partial failure of the wiring or contacts for one entire input pair, causing delayed signal transmission.
• Varying environmental factors (e.g., temperature) affecting the performance of one button more than the other.

Click steps to track your progress.

1. 1

   1. Observe the operator's simultaneous actuation of both two-hand control pairs and provide retraining if an inconsistent actuation pattern is identified.

2. 2

   2. Test the electrical response time of each two-hand button assembly individually using an oscilloscope to detect differences greater than 50ms.

3. 3

   3. Review and potentially increase the 'BetweenPairDiscrepancyTime' parameter (e.g., P_TwoHandTimeDiff) in the safety controller configuration.

4. 4

   4. Verify the integrity and continuity of all four input lines (two for each pair) to ensure consistent signal transmission to the safety PLC.

5. 5

   5. Execute a safety system acknowledgement or reset procedure (e.g., by pressing a designated 'Reset' button on the HMI) to clear the active safe state and restart the FB TWOHAND function.