The Movomatic EM 261 is a precision measuring cord used as a gap‑control sensor in industrial automation systems. Common failure modes include loss of signal due to damaged wiring, insulation breakdown, or connector corrosion; users often report “not sensing properly” when the sensor output drops or fluctuates. First‑check diagnostics: verify that the power supply voltage and ground reference are within spec on the sensor’s input pins, inspect all connectors and cable for visible wear or fraying, and use an oscilloscope to confirm a clean sinusoidal output against the expected waveform. If signal integrity is confirmed but the system still reports errors, review any associated error codes in the host controller and check for firmware mismatches.[oss-gpt-20b]