The F3SJ-A1220P55 is an Omron F3SJ-A series safety light curtain with a 55mm detection capability — that's the smallest object the curtain reliably catches. A 55mm detection capability means it's sized for leg and body protection, not hand or finger detection. The 1220mm protective height covers the access zone for a standing operator reaching into a hazard. The 50mm beam pitch and 25 beams define the resolution: a 55mm object anywhere in the 0.2m to 9.0m operating range trips the output. The IP65 rating means the emitter and receiver housings are dust-tight and protected against water jets — suitable for washdown environments in food processing or general manufacturing, though not for submersion.
Deployment context
This light curtain guards a hazard zone — typically a press, robot cell, or conveyor infeed — where a person's legs or body entering the area must stop the machine. The 24VDC supply powers both the emitter and receiver; the receiver outputs a safety-rated signal (OSSD) that connects to a safety controller or safety PLC. The blanking and muting functions let the curtain ignore fixed obstructions (blanking) or temporarily disable itself during a material feed cycle (muting), which is common on automated assembly lines where a pallet passes through the guarded opening.