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Schneider Electric TM251MDESE

Schneider TM251MDESE Modicon M251 Processor Module

MPNTM251MDESE
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Schneider Electric Modicon M251 processor module, TM251MDESE, 24 V DC, 64 MB RAM, dual Ethernet, real-time clock, battery backup, 3.5 x 2.1 x 3.5 in.

Schneider Electric TM251MDESE datasheet (PDF)
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Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

TM251MDESE key specifications
ParameterValue
Battery typeBR2032 lithium non-rechargeable 4 year(s)
Range of productModicon M251
Product or component typeProcessor module
Integrated connection typeUSB port mini B USB 2.0 Non isolated serial link serial RJ45 RS232/RS485 Dual-port Ethernet 1 2 RJ45 Ethernet port Ethernet 2 RJ45
Surge withstand1 kV shielded cable common mode EN/IEC 61000-4-5 1 kV power lines common mode EN/IEC 61000-4-5 0.5 kV power lines differential mode EN/IEC 61000-4-5
Supply voltage limits19.2...28.8 V
Supply voltage24 V DC
Power consumption in45 W with max number of I/O expansion module)
IP degree of protectionIP20 with protective cover in place
Communication serviceModbus TCP client Modbus TCP server OPC UA server NTP client
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 3.81 mm)

All specifications

TM251MDESE additional specifications
ParameterValue
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 1 gn 8.4...150 Hz symmetrical rail 3 gn 8.7...150 Hz panel mounting
Depth3.5 in (90 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 EN/IEC 61131-2 UL 508
MarkingCE
CategoryUS1PC1522555
Backup time2 years 77 °F (25 °C)
Clock drift<= 60 s/month 14...122 °F (-10...50 °C)
Port ethernetEthernet 10BASE-T/100BASE-TX - 2 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)
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 61000-6-4 Conducted emissions 63 dBμV/m QP power lines)1.5...30 MHz IEC 61000-6-4 Radiated emissions 40 dBμV/m QP class A 10 m)30...230 MHz IEC 61000-6-4 Conducted emissions 79...63 dBμV/m QP power lines)150...1500 kHz IEC 61000-6-4 Radiated emissions 47 dBμV/m QP class A 10 m)230...1000 MHz IEC 61000-6-4
Resistance to fast transients2 kV EN/IEC 61000-4-4 power lines) 1 kV EN/IEC 61000-4-4 Ethernet line) 1 kV EN/IEC 61000-4-4 serial link)
Ambient air temperature for storage-40...158 °F (-40...70 °C)
Resistance to conducted disturbances10 V 80...1000 MHz EN/IEC 61000-4-3 3 V 1.4 GHz...2 GHz EN/IEC 61000-4-3 1 V 2 GHz...3 GHz EN/IEC 61000-4-3
Resistance to electromagnetic fields9.1 V/m (10 V/m) 80 MHz...1 GHz EN/IEC 61000-4-3 2.7 V/m (3 V/m) 1.4 GHz...2 GHz EN/IEC 61000-4-3 0.9 V/m (1 V/m) 2 GHz...3 GHz EN/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 EN/IEC 61000-4-2 4 kV on contact EN/IEC 61000-4-2

Product details

The Modicon M251 TM251MDESE is a 24 V DC processor module with dual Ethernet for Modbus TCP and OPC UA. It measures 3.5 x 2.1 x 3.5 in and draws up to 45 W.

Integration Notes

The processor mounts on a TH35-15 or TH35-7.5 DIN rail, or on a plate using a fixing kit. The power supply connects via a removable screw terminal block (3.81 mm pitch). Up to 16 GB SD card can be inserted for program storage or data logging. The 128 MB built-in flash backs up user programs, and system memory is 64 MB RAM. The module includes eight status LEDs (PWR, RUN, ERR, I/O, SD, BAT, SL, TM4 bus fault). For communication service, Modbus TCP client/server and NTP client are built in; OPC UA server enables MES/SCADA connectivity.

Frequently asked questions

What are the key dimensions and panel space requirements?

The module is 3.5 x 2.1 x 3.5 inches (90 x 54 x 90 mm). It fits on a top-hat TH35 rail or can be plate-mounted.

What certifications and standards does it meet?

It is UL 508 listed, CSA C22.2 No 142 and No 213, EN/IEC 61131-2, ANSI/ISA 12-12-01, and carries CE marking.

What are the power supply requirements?

Rated supply voltage is 24 V DC, with limits 19.2 to 28.8 V. Maximum power consumption is 45 W with full I/O expansion.

MPN
TM251MDESE