I. Basic Information
Brand: Schneider
Series: Modicon M251 Medium and Small-sized PLC Model meaning
TM251: M251 CPU Host Series
M: Standard Type
E: With Ethernet
SE: Three-port Ethernet Version (Dual-port Switch + Independent Ethernet Ports)
Comparison within the same series: TM251MESC is a dual-port + CANopen version, while this model does not have CANopen. It has one additional independent Ethernet port from Schneider Electric.
Built-in I/O Points (Integrated in the Body)
Digital Input: 16 channels of 24VDC leak type / source type general-purpose
Digital Output: 16 channels of transistor output (0.5A, high-speed pulse support)
Total I/O of the body: 32 points (16DI + 16DO)
Extensible: TM3/TM2 series digital and analog modules, up to 7 modules can be expanded
Communication Interfaces (Core Configuration)
Dual-port built-in Ethernet Switch (2×RJ45)
Support Modbus TCP, EtherNet/IP, HTTP, FTP, SNTP, can be cascaded for networking
Independent 3rd port Ethernet RJ45
Used for network isolation, can be connected to the equipment network, upper-level monitoring network, touch screen, achieving physical partition of internal and external networks. Schneider Electric
RJ45 Serial Port: RS232/RS485 adaptive, supports Modbus RTU master-slave
Mini-USB Port: Program download, local debugging
SD Card Slot: Program backup, log storage, firmware upgrade
Core Performance Parameters
Program Storage: 8MB Flash; Memory: 64MB RAM
Instruction Speed: Boolean instructions 0.3ms/1K, numerical calculation 0.7ms/1K
High-speed Counting: 4 channels 100kHz single-phase / 2 channels 50kHz AB phase encoders
Pulse Output: 4 channels 100kHz, supports servo step positioning control
Power Supply: 24VDC (20.4~28.8VDC), power consumption approximately 12W
Installation: DIN TH35 rail installation, size 54×90×95mm
Operating Temperature: 0℃~60℃, protection IP20
Main Functional Characteristics
Multi-network segment isolation networking: The three Ethernet ports can be divided into different network segments. The equipment network and monitoring network are separated, improving industrial control network security
Motion Control: Supports electronic gears, point positioning, pulse following, suitable for small assembly lines, packaging, machine tools
Standard industrial protocols: Modbus TCP/RTU, EtherNet/IP, can be connected to frequency converters, servos, touch screens, SCADA upper systems
Event tasks, high-speed interrupts, SOE event recording, supports multi-task scheduling
Support remote download, web monitoring, SD card one-click program copy
Typical Application Scenarios
Packaging machinery, textile equipment, conveyor lines
HVAC, water treatment, air compressors, small pump stations automation
Buildings, new energy, photovoltaic auxiliary control, environmental protection equipment
Small and medium-sized automation projects requiring network isolation of multiple network segments
Differences in Model Selection of the Same Model Table
Model Network Port Configuration Bus Applicable Scenarios
TM251MESE 3 Ethernet ports (2 switch ports + independent network ports) No CANopen Requires internal and external network isolation, multi-device Ethernet networking
TM251MESC 2 Ethernet switches With CANopen Requires CANopen bus servo, distributed IO scenarios
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