XPSCM1144 is a Preventa XPS CM safety module - it monitors a single-beam photo-electric sensor and proves the guard state at 24V DC.

Why a dedicated safety module instead of relay logic?

It delivers Category 2 / PL c / SILCL 1 (with a correctly wired system), 2 volt-free NO safety outputs, and built-in muting, with MTTFd 16.6 years and PFH 3.12E-7 - a certified result you'd otherwise hand-wire from relays and then have to validate yourself. The alternative - a generic relay ladder - shifts the certification burden onto your panel and your risk assessment.

What does the muting and response look like?

4 sensor inputs plus 2 muting inputs (MA/MB) with 60 s max muting and 3 s sync; response time on input open is 25 ms. That lets a pallet cross the beam without dropping the guard, then re-arms. The alternative - a module without muting - stops the line every time product passes, killing throughput.

How is it installed and indicated?

DIN rail, screw terminals, IP20/IP40, 5 front LEDs for supply, restart, and output state, -10 to 55 C. The alternative - a sealed safety PLC - is overkill for one beam and costs far more per guarded point.