Siemens 6ES5451-4UA14 Programmable Logic Controller Module

Siemens 6ES5451-4UA14 is a SIMATIC S5 digital output module (451-4) intended for use with legacy S5 backplanes, delivering 32 isolated DC 24 V outputs that are rated at 0.5 A per channel, all housed in a compact, space-efficient form factor designed to retrofit or expand older PLC systems. Marketed as a spare part, this module carries PM500 lifecycle status and is documented by Siemens as end-of-life with no replacement as of October 1, 2022. The 32 outputs are designed to switch typical 24 V DC loads such as relays, solenoids, and small actuators, with their isolation helping to minimize interference between output circuits and the main control logic. Official data list a net weight of about 0.62 kg and packaging dimensions of roughly 21.3 cm by 26.2 cm by 3.5 cm, underscoring its compact footprint and compatibility with standard S5 enclosures.