The Omron CQM1‑OD214 is a DIN‑rail mounted 16‑point PNP transistor output module rated 5–24 VDC with a maximum switching current of 50 mA at 4.5 VDC to 300 mA at 26.4 VDC. Common failure points for this class of modules include burnt or tripped transistors due to overcurrent, insulation breakdown causing leakage currents above the 0.1 mA spec, and mechanical damage to the output contacts from repeated cycling. First‑check diagnostics should verify that the supply voltage is within the specified range and stable, inspect each output for physical signs of arcing or corrosion, and test individual outputs with a multimeter or oscilloscope to confirm proper on/off switching and current limits; review any error codes logged by the host PLC for indications of I/O faults.[oss-gpt-20b]