Schneider Modicon M251 PLC TM251MESE Dual Ethernet
Schneider Electric

Schneider Modicon M251 PLC TM251MESE Dual Ethernet

Part numberTM251MESEItem numberCB-SCH-050EAN / GTIN3606480648878HS code8537.10
IEC 61131-2
MaterialPolycarbonate/ABS housingCE, UL, CSA, RCM, EAC
MOQ:1

Pricing

Request a quote

We reply within 24 hours

Product Description

Schneider Electric TM251MESE Modicon M251 logic controller, no embedded I/O, 2 isolated Ethernet ports + 1 serial line.

Technical Specifications

Series
Modicon M251, Digital Inputs: 0 (uses TM3 expansion or remote I/O), Digital Outputs: 0 (uses TM3 expansion or remote I/O), Communication: 2x isolated Ethernet (Modbus TCP, EtherNet/IP), 1x serial (RS232/485), Supply Voltage: 24V DC, Expansion: Up to 14 TM3 modules, Programming: EcoStruxure Machine (CODESYS), Mounting: 35mm DIN rail or screw plate
Range of product
Modicon M251
Product or component type
Logic controller
[Us] rated supply voltage
24 V DC
Maximum number of I/O expansion module
7 (local I/O-Architecture); 14 (remote I/O-Architecture)
Supply voltage limits
20.4…28.8 V
Inrush current
50 A
Power consumption in W
32.6…40.4 W (with max number of I/O expansion module)
Memory capacity
64 MB for system memory RAM
Data backed up
128 MB built-in flash memory for backup of user programs
Data storage equipment
<= 16 GB SD card (optional)
Battery type
BR2032 lithium non-rechargeable, battery life: 4 year(s)
Backup time
2 years at 25 °C
Execution time for 1 KInstruction
0.3 ms for event and periodic task; 0.7 ms for other instruction
Application structure
4 cyclic master tasks; 8 event tasks; 3 cyclic master tasks + 1 freewheeling task; 8 external event tasks
Realtime clock
With
Clock drift
<= 60 s/month at 25 °C
Integrated connection type
USB port with mini B USB 2.0 connector; Non isolated serial link serial with RJ45 connector and RS232/RS485 interface ; Dual-port Ethernet 1 with RJ45 connector; Ethernet port Ethernet 2 with RJ45 connector
Supply
(serial)serial link supply: 5 V, <200 mA
Transmission rate
1.2...115.2 kbit/s (115.2 kbit/s by default) for bus length of 15 m for RS485; 1.2...115.2 kbit/s (115.2 kbit/s by default) for bus length of 3 m for RS232; 480 Mbit/s for bus length of 3 m for USB
Communication port protocol
USB port: USB - SoMachine-Network; Non isolated serial link: Modbus master/slave - RTU/ASCII or SoMachine-Network
Port Ethernet
Ethernet 1 marking 10BASE-T/100BASE-TX - 2 copper cable; Ethernet 2 marking 10BASE-T/100BASE-TX - 1 copper cable
Web services
Web server
Communication service
Downloading; 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
Maximum number of connections
8 Modbus server; 8 Modbus client; 16 Ethernet/IP target; 4 FTP server; 10 web server; 8 SoMachine protocol
Number of server device(s)
16 EtherNet/IP: ; 64 Modbus TCP:
Cycle time
10 ms 16 EtherNet/IP; 64 ms 64 Modbus TCP
Local signalling
1 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)
Electrical connection
removable screw terminal blockpower supply (pitch 5.08 mm)
Insulation
Non-insulated between supply and internal logic; Between supply and ground at 500 V AC
Marking
CE
Surge withstand
1 kV shielded cable common mode conforming to IEC 61000-4-5; 1 kV power lines common mode conforming to IEC 61000-4-5; 0.5 kV power lines differential mode conforming to IEC 61000-4-5
Mounting support
Top hat type TH35-15 rail conforming to IEC 60715; Top hat type TH35-7.5 rail conforming to IEC 60715; plate or panel with fixing kit
Height
90 mm
Depth
95 mm
Width
54 mm
Product weight
0.22 kg
Standards
ANSI/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
Product certifications
cULus; CE; UKCA; DNV-GL; ABS; LR
Resistance to electrostatic discharge
8 kV in air conforming to IEC 61000-4-2; 4 kV on contact conforming to IEC 61000-4-2
Resistance to electromagnetic fields
10 V/m 80 MHz...1 GHz conforming to IEC 61000-4-3; 3 V/m 1.4 GHz...2 GHz conforming to IEC 61000-4-3; 1 V/m 2 GHz...3 GHz conforming to IEC 61000-4-3
Resistance to fast transients
2 kV (power lines) conforming to IEC 61000-4-4; 1 kV (Ethernet line) conforming to IEC 61000-4-4; 1 kV (serial link) conforming to IEC 61000-4-4
Resistance to conducted disturbances
10 V 0.15...80 MHz conforming to IEC 61000-4-6; 3 V 0.1...80 MHz conforming to 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) conforming to Marine specification (LR, ABS, DNV, GL)
Electromagnetic emission
Conducted emissions - test level: 120...69 dBµV/m QP ( power lines) at 10…150 kHz conforming to IEC 55011; Conducted emissions - test level: 63 dBμV/m QP ( power lines) at 1.5…30 MHz conforming to IEC 55011; Radiated emissions - test level: 40 dBμV/m QP class A ( 10 m) at 30…230 MHz conforming to IEC 55011; Conducted emissions - test level: 79...63 dBμV/m QP ( power lines) at 150…1500 kHz conforming to IEC 55011; Radiated emissions - test level: 47 dBμV/m QP class A ( 10 m) at 230…1000 MHz conforming to IEC 55011
Immunity to microbreaks
10 ms
Ambient air temperature for operation
-10…35 °C (vertical installation); -10…55 °C (horizontal installation)
Ambient air temperature for storage
-25…70 °C
Relative humidity
10…95 %, without condensation (in operation); 10…95 %, without condensation (in storage)
IP degree of protection
IP20 with protective cover in place
Pollution degree
2
Operating altitude
0...2000 m
Storage altitude
0…3000 m
Vibration resistance
3.5 mm at 5…8.4 Hz on symmetrical rail; 3 gn at 8.4…150 Hz on symmetrical rail; 3.5 mm at 5…8.4 Hz on panel mounting; 3 gn at 8.4…150 Hz on panel mounting
Shock resistance
15 gn for 11 ms
Number of Units in Package 1
1
Number of Units in Package 2
10
Number of Units in Package 3
80
Country of origin
ID
Warranty (in months)
18
EAN
3606480648878

Standards & Compliance

Standard
IEC 61131-2
Material
Polycarbonate/ABS housing
Temperature Range
0°C to +55°C
Classification / Approval
CE, UL, CSA, RCM, EAC
HS Code
8537.10

Compatibility & Fitment

Two isolated Ethernet ports for separated control/device networks. TM3 expansion modules supported. EcoStruxure Machine.

Not sure if it fits? Email sales@cballast.com with your equipment serial number or photos — we confirm fit before you order.

Product Documentation

Document preview: Schneider Electric TM251MESE — OEM Product Page

Catalogue entry last verified: 2026-08-24. A manufacturer datasheet is attached to this entry — confirm application-critical values against it.

Frequently asked questions

Where can I buy TM251MESE?
TM251MESE can be ordered from cballast.com as a Schneider Electric catalogue item: request a quotation on this page or email sales@cballast.com, and the order ships worldwide.
What is the manufacturer part number for this Schneider Electric product?
The manufacturer part number is TM251MESE.
What is the HS code for TM251MESE?
The customs tariff (HS) code for TM251MESE is 8537.10.
Who manufactures TM251MESE?
TM251MESE is a Schneider Electric product in the Control & Automation range.
Is a datasheet available for TM251MESE?
Yes — the TM251MESE datasheet can be viewed and downloaded on this page.
What is the minimum order quantity for TM251MESE?
The minimum order quantity is 1.
Is TM251MESE available?
Yes — TM251MESE is available to order: fulfilment is from supplier stock in cBallast's European network, dispatched directly from the warehouse to the customer, with the exact lead time stated in the quotation (reply within 24 hours).