Omron · NJ/NX-series Machine Automation Controller
One or both of the photocouplers for safety inputs 1 and 2 have transitioned to an OFF state, triggering a safety error. This typically indicates an issue with the safety circuit integrity, such as a physical cable problem.
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Visually inspect the cables connected to safety inputs 1 and 2 for physical damage or disconnections.
Measure continuity of the safety input cables for inputs 1 and 2.