PM-E power module for ET 200S — 24-48 V DC with diagnostics
The Siemens 6ES7138-4CA50-1AB0 is a spare-part PM-E power module for the ET 200S distributed I/O system, delivering 24-48 V DC to the backplane with integrated diagnostics — the diagnostic channel reports load supply faults upstream to the controller, so a blown field fuse or a dropped 24 V leg gets flagged before the next scan cycle loses the I/O map.
The module occupies a single 15 mm wide slot on the ET 200S DIN-rail mounting rail, with a height of 81 mm and a depth of 52 mm — the narrow width means it fits in a dense I/O rack without crowding the adjacent electronic modules or terminal blocks.