
Schneider Modicon M251 PLC TM251MESE Dual Ethernet
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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.
Product Documentation
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Technical guides
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).
