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Schneider Electric TM251MESE

Schneider TM251MESE Modicon M251 PLC, Current Production

MPNTM251MESE
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Schneider Electric Modicon M251 PLC, TM251MESE, 20.4-28.8 VDC supply, dual Ethernet ports, 64 MB system RAM, 128 MB flash backup, current production.

$311.15 – $798.46Ref. price · indicative, final on quote
Schneider Electric TM251MESE datasheet (PDF)
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MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

TM251MESE key specifications
ParameterValue
Battery typeBR2032 lithium non-rechargeable 4 year(s)
Range of productModicon M251
Product or component typeLogic controller
Integrated connection typeUSB port mini B USB 2.0 Non isolated serial link serial RJ45 RS232/RS485 Dual-port Ethernet 1 RJ45 Ethernet port Ethernet 2 RJ45
Surge withstand1 kV shielded cable common mode IEC 61000-4-5 1 kV power lines common mode IEC 61000-4-5 0.5 kV power lines differential mode IEC 61000-4-5
Supply voltage limits20.4...28.8 V
Supply voltage24 V DC
Inrush current50 A
Power consumption in32.6...40.4 W with max number of I/O expansion module)
IP degree of protectionIP20 with protective cover in place
Communication serviceDownloading IEC VAR ACCESS Modbus TCP client Modbus TCP server Modbus TCP slave device Monitoring NGVL Programming Updating firmware SMS notifications DHCP client Eth1) DHCP server Eth2) Ethernet/IP originator Eth2) Ethernet/IP target Eth1, Eth2) Ethernet/IP scanner Eth2) Modbus TCP I/O Scanner and Messaging Eth2) FDR FTP client/server SNMP client/server SQL client Send and receive email from the controller based on TCP/UDP library Web server (WebVisu & XWeb system) OPC UA server DNS client
Communication port protocolUSB port USB - SoMachine-Network Non isolated serial link Modbus master/slave - RTU/ASCII or SoMachine-Network

All specifications

TM251MESE additional specifications
ParameterValue
Mounting supportTop hat type TH35-15 rail IEC 60715 Top hat type TH35-7.5 rail IEC 60715 plate or panel with fixing kit
Electrical connectionremovable screw terminal block power supply pitch 5.08 mm)
Maximum number of connections8 Modbus server 8 Modbus client 16 Ethernet/IP target 4 FTP server 10 web server 8 SoMachine protocol
Pollution degree2
Shock resistance15 gn 11 ms
Storage altitude0...9842.5 ft (0...3000 m)
Relative humidity10...95 %, without condensation in operation) 10...95 %, without condensation in storage)
Operating altitude0...6561.68 ft (0...2000 m)
Vibration resistance3.5 mm 5...8.4 Hz symmetrical rail 3 gn 8.4...150 Hz symmetrical rail 3.5 mm 5...8.4 Hz panel mounting 3 gn 8.4...150 Hz panel mounting
Depth3.7 in (95 mm)
Width2.1 in (54 mm)
Height3.5 in (90 mm)
StandardsANSI/ISA 12-12-01 CSA C22.2 No 142 CSA C22.2 No 213 IEC 61131-2:2007 Marine specification (LR, ABS, DNV, GL) UL 508
SupplySerial)serial link supply 5 V, <200 mA
MarkingCE
CategoryUS10MSX22533
Cycle time10 ms 16 EtherNet/IP 64 ms 64 Modbus TCP
InsulationNon-insulated between supply and internal logic Between supply and ground 500 V AC
Backup time2 years 77 °F (25 °C)
Clock drift<= 60 s/month 77 °F (25 °C)
Web servicesWeb server
Port ethernetEthernet 1 10BASE-T/100BASE-TX - 2 copper cable Ethernet 2 10BASE-T/100BASE-TX - 1 copper cable
Data backed up128 MB built-in flash memory backup of user programs
Realtime clockWith
Memory capacity64 MB system memory RAM
Local signalling1 LED (green) for PWR 1 LED (green) for RUN 1 LED (red) for module error (ERR) 1 LED (red) for I/O error (I/O) 1 LED (green) for SD card access (SD) 1 LED (red) for BAT 1 LED (green) for SL 1 LED (red) for bus fault on TM4 (TM4) 1 LED (green) for Ethernet activity (ETH1) 1 LED (green) for Ethernet activity (ETH2)
Transmission rate1.2...115.2 kbit/s (115.2 kbit/s by default) 49.2 ft (15 m) RS485 1.2...115.2 kbit/s (115.2 kbit/s by default) 9.8 ft (3 m) RS232 480 Mbit/s 9.8 ft (3 m) USB
Application structure4 cyclic master tasks 8 event tasks 3 cyclic master tasks + 1 freewheeling task 8 external event tasks
Data storage equipment<= 16 GB SD card optional)
Immunity to microbreaks10 ms
Electromagnetic emissionConducted emissions 120...69 dBµV/m QP power lines)10...150 kHz IEC 55011 Conducted emissions 63 dBμV/m QP power lines)1.5...30 MHz IEC 55011 Radiated emissions 40 dBμV/m QP class A 10 m)30...230 MHz IEC 55011 Conducted emissions 79...63 dBμV/m QP power lines)150...1500 kHz IEC 55011 Radiated emissions 47 dBμV/m QP class A 10 m)230...1000 MHz IEC 55011
Number of server device16 EtherNet/IP 64 Modbus TCP
Resistance to fast transients2 kV IEC 61000-4-4 power lines) 1 kV IEC 61000-4-4 Ethernet line) 1 kV IEC 61000-4-4 serial link)
Execution time for 1 KInstruction0.3 ms event and periodic task 0.7 ms other instruction
Ambient air temperature for storage-13...158 °F (-25...70 °C)
Resistance to conducted disturbances10 V 0.15...80 MHz IEC 61000-4-6 3 V 0.1...80 MHz Marine specification (LR, ABS, DNV, GL) 10 V spot frequency (2, 3, 4, 6.2, 8.2, 12.6, 16.5, 18.8, 22, 25 MHz) Marine specification (LR, ABS, DNV, GL)
Resistance to electromagnetic fields9.1 V/m (10 V/m) 80 MHz...1 GHz IEC 61000-4-3 2.7 V/m (3 V/m) 1.4 GHz...2 GHz IEC 61000-4-3 0.9 V/m (1 V/m) 2 GHz...3 GHz IEC 61000-4-3
Ambient air temperature for operation14...95 °F (-10...35 °C) vertical installation) 14...131 °F (-10...55 °C) horizontal installation)
Resistance to electrostatic discharge8 kV in air IEC 61000-4-2 4 kV on contact IEC 61000-4-2

Product details

Communication and performance

Dual Ethernet ports handle 10BASE-T/100BASE-TX, each with its own IP stack. That means one port can run a machine-level EtherNet/IP scanner while the second talks to a plant-wide Modbus TCP network — or serve as a web server via the embedded WebVisu. Cycle times: expect 10 ms for 16 EtherNet/IP connections, 64 ms for 64 Modbus TCP devices. For serial legacy gear, there's an RS485 port (15 m at 115.2 kbit/s) and an RS232 (3 m). USB is there for local programming at 480 Mbit/s. Memory-wise, the TM251MESE has 64 MB of system RAM and 128 MB of built-in flash for user program backup — no SD card required for basic retention. The real-time clock runs off a BR2032 lithium battery, which keeps the time for up to two years at 25 °C. Clock drift is under 60 seconds per month at that temperature, so scheduled events stay on track. An optional SD card (up to 16 GB) can hold extra logs or recipes.

Environment and isolation

Rated for pollution degree 2 environments — typical for dry, non-conductive dust conditions inside an enclosure. It handles 15 gn shock for 11 ms and vibration as per IEC 60068-2-6: 3.5 mm amplitude up to 8.4 Hz, then 3 gn up to 150 Hz. Operating altitude goes to 2000 m; storage altitude to 3000 m. Humidity tolerance is 10–95% non-condensing across operation and storage. Isolation between supply and ground is a single 500 V AC barrier — non-isolated between supply and internal logic. That's typical for PLCs in this class; just ensure the external 24 VDC supply is properly grounded and filtered to avoid ground loops.

Frequently asked questions

What compliance documentation does the TM251MESE have?

The controller carries CE marking and complies with UL 508, ANSI/ISA 12-12-01, CSA C22.2 Nos. 142 and 213, IEC 61131-2, and marine specifications from LR, ABS, DNV, and GL.

What is the power supply range for the TM251MESE?

The supply voltage is 20.4–28.8 VDC, with a typical power consumption of 32.6–40.4 W when using the maximum number of I/O expansion modules.

How does the TM251MESE retain programs and real-time clock?

Programs are backed up to 128 MB of built-in flash memory. The real-time clock is powered by a BR2032 lithium battery that provides up to 2 years of backup at 25 °C.

MPN
TM251MESE