Allen-Bradley · MicroLogix 1400 Programmable Controllers
This error is generated whenever a hard stop condition is detected by the PTOX subsystem, indicating that a physical limit or emergency stop input has been activated. This error does not fault the controller.
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Scan the PTOX instruction on a false rung to acknowledge the error condition.
Reset the EH (Enable Hard Stop) bit to 0 in the PTOX configuration to clear the error.
Inspect the physical hard stop sensor and its wiring to ensure it is not falsely triggering or stuck in an activated state.