Peer comparison — SME-8M-DS-24V-K-5,0-OE
The closest functional peer is the SME-8M-DS-24V-K-5,0-OE — also a Festo proximity sensor, but with an 8 mm barrel (SME-8M series) instead of the M5 thread on this part. The SME-8M variant uses a magnetic reed element, switches at 500 mA, and comes with a 5-meter cable. The SIE-M5S-PS-K is the smaller M5 form factor, suited for tighter cylinder ports where the 8 mm diameter won't fit. If your panel was specified around the SME-8M-DS-24V-K-5,0-OE, the SIE-M5S-PS-K will not drop in without changing the mounting thread — the M5 vs 8 mm difference is a mechanical, not electrical, constraint.