The TM251MESC from Schneider Electric represents a versatile and high-performance logic controller within the Modicon M251 family. This controller operates on a 24 V DC supply and provides comprehensive communication capabilities including dual-port Ethernet, CANopen, and non-isolated serial links. Furthermore, the TM251MESC supports up to 7 local and 14 remote I/O expansion modules, offering exceptional scalability for various automation projects. With 64 MB of system memory and a powerful processor, it handles complex control tasks efficiently. Consequently, this controller proves ideal for machine control, material handling, and process automation applications requiring reliable networking and fast execution.
Power Supply and Consumption: The TM251MESC accepts a supply voltage of 24 V DC with limits ranging from 20.4 to 28.8 V. Inrush current reaches 50 A during startup, while typical power consumption ranges from 32.6 to 40.4 W when operating with the maximum number of I/O expansion modules. The removable screw terminal block features a 5.08 mm pitch for secure power connections. Additionally, insulation between supply and ground is rated at 500 V AC, ensuring safety and reliability.
Memory and Data Storage: This controller provides substantial memory capacity with 64 MB of system RAM. For program backup, it includes 128 MB of built-in flash memory. Furthermore, the TM251MESC supports optional SD cards up to 16 GB for additional data storage. A BR2032 lithium non-rechargeable battery maintains real-time clock operation for approximately 4 years, with a backup time of 2 years at 25°C.
Processing Performance: Execution speed is impressive, with event and periodic tasks completing 1K instructions in just 0.3 ms. Other instructions execute in 0.7 ms. The application structure supports 3 cyclic master tasks plus 1 freewheeling task, along with 8 event tasks and 4 cyclic master tasks. Additionally, it handles 8 external event tasks, providing exceptional flexibility for complex programming requirements.
Integrated Ports: The TM251MESC features multiple built-in communication interfaces. A mini B USB 2.0 port enables convenient programming and diagnostics. A non-isolated serial link via RJ45 supports both RS232 and RS485 protocols with transmission rates from 1.2 to 115.2 kbit/s. Dual-port Ethernet provides 10BASE-T/100BASE-TX connectivity with two copper cable ports. Additionally, a CANopen J1939 SUB-D 9 port supports device networking.
Protocol Support: The Ethernet port supports extensive protocols including DHCP client, Ethernet/IP slave device, Modbus TCP client/server/slave, and web server functionality. It also enables FTP client/server, SNMP client/server, SQL client, and email sending capabilities based on TCP/UDP libraries. OPC UA server and DNS client are also supported. The CANopen feature complies with DR 303-1 and DS 301 V4.02, supporting up to 63 server devices.
Connection Capacity: The TM251MESC handles 8 Modbus servers, 8 Modbus clients, and 16 Ethernet/IP targets simultaneously. Additionally, it supports 4 FTP servers, 10 web server connections, and 8 SoMachine protocol sessions. This extensive connectivity makes it suitable for demanding networked automation environments.
Physical Dimensions: The controller measures 90 mm in height, 95 mm in depth, and 54 mm in width. Net weight is 0.22 kg, while packaged weight reaches 0.38 kg. Its compact footprint allows efficient use of panel space.
Mounting Options: The TM251MESC installs on top hat type TH35-15 or TH35-7.5 rails conforming to IEC 60715. Alternatively, panel mounting with a fixing kit provides additional installation flexibility. The IP20 protection rating with protective cover ensures safe operation in typical industrial environments.
Environmental Resilience: Operating temperature ranges from -10 to 55°C for horizontal installation and -10 to 35°C for vertical mounting. Storage temperature spans -25 to 70°C. Relative humidity tolerance is 10 to 95% without condensation. Operating altitude reaches 2000 m, with storage altitude up to 3000 m. Vibration resistance includes 3.5 mm at 5 to 8.4 Hz and 3 gn at 8.4 to 150 Hz for both DIN rail and panel mounting. Shock resistance is rated at 15 gn for 11 ms.
Certifications: The TM251MESC holds numerous certifications including cULus, CE, UKCA, DNV-GL, ABS, and LR. It complies with IEC 61131-2:2007, ANSI/ISA 12-12-01, CSA C22.2 No 142 and No 213, Marine specifications, and UL 508 standards.
Proper installation ensures the TM251MESC delivers reliable performance throughout its operational life. Begin by disconnecting all power sources before handling the controller. Mount the unit securely on the chosen DIN rail or panel using appropriate hardware.
Wiring Instructions: The power supply connects via the removable screw terminal block with 5.08 mm pitch. Use appropriate conductor sizes for the 24 V DC supply. The USB port provides convenient programming access without requiring network configuration. For Ethernet connections, use standard CAT5e or CAT6 cables. The CANopen network requires proper termination and cabling according to DR 303-1 specifications.
Important Considerations:
Observe temperature derating for vertical installation
Maintain adequate clearance around the controller for ventilation
Ensure proper grounding for electromagnetic compatibility
Use shielded cables for serial and CANopen connections in noisy environments
Install the battery correctly to maintain real-time clock operation
The Schneider TM251MESC is carefully packaged to prevent damage during transit.
Package Contents:
Modicon M251 Logic Controller (TM251MESC)
Removable screw terminal block for power supply
Protective packaging materials
Shipping Logistics: All orders ship promptly via premium courier services. We exclusively partner with Fedex, UPS, and DHL to ensure your controller arrives safely and within expected delivery windows.
1. Which programming software supports the TM251MESC?
The TM251MESC is programmed using Schneider Electric's SoMachine software platform.
2. How many I/O modules can connect to this controller?
The TM251MESC supports 7 local and 14 remote I/O expansion modules.
3. What communication protocols does the Ethernet port support?
The Ethernet port supports Modbus TCP, Ethernet/IP, web server, FTP, SNMP, SQL client, OPC UA server, and more.
4. Can I expand data storage on this controller?
Yes, the TM251MESC supports optional SD cards up to 16 GB for additional data storage.
5. What marine certifications does this controller hold?
The TM251MESC is certified by DNV-GL, ABS, and LR for marine applications.
| Brand Name | |
| Model No. | TM251MESC |
| Product Type | Logic Controller |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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