Two-Hand Sequence Violation
Beckhoff · TwinSAFE Logic FB
What does FB TWOHAND Bit 6 mean?
A specific two-hand error sequence violation has occurred: one input pair was actuated, and while waiting for the second, the first input pair was released before the second was actuated. This indicates an incorrect operating procedure or a 'teasing' attempt, which compromises the safety principle of simultaneous two-hand control and halts the machine.
Complete Troubleshooting Guide
- 1
Re-instruct the operator on the correct sequence for two-hand control: both hands must be actuated and held within the defined time window simultaneously.
- 2
Observe the operator during actuation to identify any deviation from the correct procedure or attempts to 'tease' the controls.
- 3
Review the mechanical and electrical integrity of the two-hand control device to ensure reliable sensing and hold functionality.
- 4
Check the timing parameters within the FB TWOHAND configuration related to sequence monitoring for proper values.