Schneider Electric TM251MESE Programmable Logic Controller

Schneider Electric's TM251MESE is a Modicon M251 Logic Controller with two Ethernet interfaces — a built-in dual-port Ethernet switch and a separate Ethernet port for fieldbus — plus a front-panel serial line port and a USB Mini-B programming port for convenient setup and recovery. It ships with 8 MB of program memory, 64 MB of RAM, 128 MB of built-in flash memory to back up user programs, and support for an SD card up to 32 GB, enabling compact code storage and project data on site. Programming is performed with EcoStruxure Machine Expert, and the M251 family supports IEC 61131-3 languages including IL, ST, FBD, SFC, LD, and CFC, with the ability to deploy code via Machine Expert's industrial Ethernet workflows. This controller is designed for compact automation tasks, with integration into Schneider Electric's Modicon ecosystem for machine control, panel builders, and small- to mid-scale process applications.