Omron · NJ/NX-series Machine Automation Controller
At least one of the input photocouplers for safety inputs 1 and 2 has turned OFF, indicating a potential safety circuit issue. This implies a broken or disconnected safety cable affecting the safety interlock.
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Inspect the safety input cables (safety inputs 1 and 2) for disconnection or physical damage.
Verify continuity of the safety input cables using a multimeter.