Applicable Systems
PLC
Symptoms
The PLC reports a position limit fault. The axis position exceeded the configured travel limit, halting motion for safety.
Possible Causes
- Positioning command sent beyond the configured travel limits
- Encoder feedback error causing false position calculation
- Home position offset incorrect causing position drift
Troubleshooting Steps
- Step 1: Check the position command against the configured travel limits
Command is within the valid travel range - Step 2: Verify the encoder feedback is accurate and without noise
Position feedback matches the physical position - Step 3: Re-home the axis if the home offset is incorrect
Home position is set correctly
How to Reset
To reset: Clear the position limit fault and re-home the axis, then restart.
Source: B&R Automation System Manual, B&R Industrial Automation
Category: PLC & VFD