Schneider TM251MESC Logic Controller Overview
The Schneider TM251MESC is a compact logic controller from the Modicon M251 series. It combines Ethernet and CANopen connectivity in a single device, making it suitable for distributed automation systems. Engineers can rely on this controller for precise control and reliable communication in industrial environments.
Key Technical Specifications
The TM251MESC operates on a 24 V DC rated supply voltage, with a range of 20.4 to 28.8 V. It consumes between 32.6 and 40.4 W when fully loaded with I/O expansion modules. The controller includes 64 MB of system RAM and 128 MB of built-in flash memory for user program backup. An optional SD card up to 16 GB provides additional data storage. A BR2032 lithium battery supports the real-time clock and SRAM backup for up to two years at 25°C.
Execution times are 0.3 ms for event and periodic tasks, and 0.7 ms for other instructions. The application structure supports up to three cyclic master tasks plus a freewheeling task, and eight event tasks. For maximum flexibility, four cyclic master tasks and eight external event tasks are available.
Connectivity and Communication
Integrated ports include a USB mini B 2.0 port, a non-isolated serial link (RJ45 RS232/RS485), a dual-port Ethernet RJ45, and a CANopen J1939 SUB-D 9 connector. The serial link supplies 5 V at less than 200 mA. Transmission rates range from 1.2 to 115.2 kbit/s for serial links, and 480 Mbit/s for USB. The Ethernet port supports 10BASE-T/100BASE-TX.
Communication protocols include Modbus master/slave (RTU/ASCII), EtherNet/IP, Modbus TCP, OPC UA server, FTP client/server, SNMP, SQL client, and web server for WebVisu and XWeb system. The controller also supports DHCP, DNS, and SMS notifications. Up to 63 CANopen devices can be connected, with CANopen profiles DR 303-1 and DS 301 V4.02.
Environmental and Certification Details
The TM251MESC is certified to cULus, CE, UKCA, DNV-GL, ABS, and LR standards. It meets ANSI/ISA 12-12-01, CSA C22.2 No 142 and 213, IEC 61131-2:2007, and UL 508. The controller withstands electrostatic discharge up to 8 kV in air and 4 kV on contact. Immunity to electromagnetic fields is tested up to 10 V/m from 80 MHz to 1 GHz, and it resists fast transients of 2 kV on power lines. Conducted emissions comply with IEC 55011 Class A.
Operating temperature range is 14 to 131°F (-10 to 55°C) when horizontally mounted, and 14 to 95°F (-10 to 35°C) vertically. The IP20 protection rating requires a protective cover. Vibration resistance is 3.5 mm displacement from 5 to 8.4 Hz, and 3 gn from 8.4 to 150 Hz. Shock resistance is 15 gn for 11 ms.
Conclusion
The Schneider TM251MESC offers robust performance for industrial automation tasks. Its combination of Ethernet, CANopen, and multiple communication protocols makes it a versatile choice for system integrators. For detailed specifications and purchasing information, visit PLC Source PRO.