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Brand: Schneider Electric
Schneider Electric TM251MESE Modicon M251 Dual Ethernet
Description
TM251MESE logic controller with 2 Ethernet ports
The TM251MESE is a Schneider Electric product listed in the datasheet as: logic controller, Modicon M251, 2x Ethernet. The TM251MESE is a Modicon M251 logic controller with two Ethernet ports. It is built for networked machines, where the controller acts as a node on a plant network and also drives devices on a separate machine network. Seven Star LLC supplies the TM251MESE in Oman and the GCC as an independent supplier based in Muscat.
Reading the reference: TM251 is the Modicon M251 family; ME marks the base in the family, S the serial interface and E the Ethernet ports, per the datasheet title of two Ethernet.
Technical specifications of the TM251MESE
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Schneider Electric / TM251MESE |
| Description | logic controller, Modicon M251, 2x Ethernet |
| Range of Product | Modicon M251 |
| Product or Component Type | Logic controller |
| [Us] rated supply voltage | 24 V DC |
| Maximum number of I/O | 7 (local I/O-Architecture) |
| expansion module | 14 (remote I/O-Architecture) |
| Supply voltage limits | 20.4 to 28.8 V |
| Inrush current | 50 A |
| Power consumption in W | 32.6 to 40.4 W with max number of I/O expansion module |
| Memory capacity | 64 MB system memory RAM |
| Data backed up | 128 MB built-in flash memory backup of user programs |
| Data storage equipment | <= 16 GB SD card optional |
| Battery type | BR2032 lithium non-rechargeable 4 year(s) |
| Backup time | 2 years 25 °C |
| Execution time for 1 KInstruction | 0.3 ms event and periodic task; 0.7 ms 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 25 °C |
| Integrated connection type | USB port mini B USB 2.0; Non isolated serial link serial RJ45 RS232/RS485; Dual-port Ethernet 1 RJ45; Ethernet port Ethernet 2 RJ45 |
| Supply | Serialserial link supply 5 V, <200 mA |
| Transmission rate | 1.2 to 115.2 kbit/s (115.2 kbit/s by default) 15 m RS485; 1.2 to 115.2 kbit/s (115.2 kbit/s by default) 3 m RS232; 480 Mbit/s 3 m 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 10BASE-T/100BASE-TX – 2 copper cable; Ethernet 2 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 |
| 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) |
| Electrical connection | removable screw terminal block power supply pitch 5.08 mm |
| Insulation | Non-insulated between supply and internal logic; Between supply and ground 500 V AC |
| Surge withstand | 1 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 |
| Mounting support | Top hat type TH35-15 rail IEC 60715; Top hat type TH35-7.5 rail IEC 60715 plate or panel with fixing kit |
| Height | 90 mm |
| Depth | 95 mm |
| Width | 54 mm |
| Net 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 | 8 kV in air IEC 61000-4-2 |
| discharge | 4 kV on contact IEC 61000-4-2 |
Network functions of the TM251MESE
Supply voltage: 24 V DC. Supply voltage limits: 20.4 to 28.8 V. Ethernet: Ethernet 1 10BASE-T/100BASE-TX – 2 copper cable; Ethernet 2 10BASE-T/100BASE-TX – 1 copper cable. Communication protocols: USB port USB – SoMachine-Network; Non isolated serial link Modbus master/slave – RTU/ASCII or SoMachine-Network.
Two Ethernet ports allow separate networks, for example a plant network on one and a machine network on the other. The datasheet lists the supported protocols and the number of devices, so review these when designing the network.
Where the TM251MESE differs from M241 and M221 units
The M251 has no embedded I/O; it is used with TM3 and TM5 expansion or with remote I/O on the network. That makes it a network-centric alternative to the M241, which carries embedded I/O.
Design the I/O architecture around the network, and plan for the cycle time of the remote I/O.
Selection checklist for the TM251MESE
- Network requirements and number of devices.
- Embedded I/O not included; plan modules.
- Protocols: Modbus TCP, EtherNet/IP as listed.
- Expansion method.
- Software: Machine Expert.
- Cyber-security measures.
Network configuration of the TM251MESE
Plan IP addresses on two subnets, configure device lists and test the communication timeouts. Use managed switches where noise is high.
Back up the project and firmware.
Typical applications of the TM251MESE in Oman and the GCC
In Oman and the GCC the M251 appears on distributed process skids that need networked I/O and a plant link.
Dimensions, environment and approvals of the TM251MESE
For the TM251MESE, plan the mounting space from the datasheet: 54 mm (W) x 90 mm (H) x 95 mm (D). The TM251MESE weighs 0.22 kg. Mounting, derating and enclosure choices follow the environmental data below, which should be compared with the actual panel temperature and the dust and humidity of the site in Oman and the GCC.
Ambient temperature limits in the datasheet: -10 to 35 °C vertical installation. Relative humidity: 10 to 95 %, without condensation in operation; 10 to 95 %, without condensation in storage. Ingress protection: IP20 with protective cover in place. Operating altitude: 0 to 2000 m. Vibration resistance: 3.5 mm 5 to 8.4 Hz symmetrical rail; 3 gn 8.4 to 150 Hz symmetrical rail; 3.5 mm 5 to 8.4 Hz panel mounting; 3 gn 8.4 to 150 Hz panel mounting. Shock resistance: 15 gn 11 ms. Standards listed: 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. Certifications listed for this reference: cULus; CE; UKCA; DNV-GL; ABS; LR.
Information to send with an RFQ for the TM251MESE
- Full reference and quantity required
- Existing equipment, panel or rack it must fit
- Supply voltage, load or signal details of the application
- Required delivery location and timing
- Whether a spare, a replacement or a new installation
Documents and quotation
A datasheet for this product is attached on this page. It lists the electrical, mechanical and environmental data summarised above.
Send us the part number, quantity and application and we will confirm availability and a quotation. Seven Star LLC is an independent supplier in Muscat and does not represent itself as an official channel of the manufacturer.
Datasheets & Documents
- Datasheet Schneider Electric TM251MESE Datasheet Download
Reviews (0)
About brand
Schneider Electric is the French group for energy management and industrial automation: low and medium voltage switchgear and circuit breakers, motor control, drives, PLCs, power monitoring, UPS systems and building management. Its history goes back to 1836, when the brothers Adolphe and Eugène Schneider took over the iron and steel works at Le Creusot in Burgundy. Over the 20th century the company left steel and heavy engineering and became an electrical group through acquisitions such as Merlin Gerin, Télémécanique, Square D and Modicon. Its head office is in Rueil-Malmaison near Paris, and its shares are listed on Euronext Paris.
Schneider Electric company profile
| Origins | 1836, Le Creusot, France: Adolphe and Eugène Schneider take over the Le Creusot foundry |
|---|---|
| Headquarters | Rueil-Malmaison (Paris region), France |
| Ownership | Public company listed on Euronext Paris |
| Key acquisitions | Télémécanique (1988), Square D (1991), Merlin Gerin (1992), Modicon (1997), APC (2007), Invensys (2014); majority owner of AVEVA software |
| Brand names still in use | Acti9, ComPacT and MasterPacT breakers, TeSys motor control, Altivar drives, Altistart soft starters, Modicon PLCs, Harmony control components, PowerLogic and Easergy protection and metering, APC UPS, EcoStruxure software platform |
| Product families | Low voltage distribution, medium voltage switchgear and protection relays, motor control and drives, PLCs and HMIs, power meters, UPS and cooling, enclosures, building automation and energy software |
Milestones
- 1836: The Schneider brothers acquire the Le Creusot works; the business grows in steel, locomotives and heavy engineering.
- 1975: First investment in Merlin Gerin, a French maker of electrical distribution equipment.
- 1988–1992: Télémécanique, Square D (USA) and Merlin Gerin join the group, making it an electrical specialist.
- 1997: Modicon, the company behind the first programmable logic controller, joins the group.
- 1999: The group takes the name Schneider Electric.
- 2007 and 2014: APC (UPS and data centre power) and Invensys (process automation) are acquired.
Choosing Schneider Electric breakers and motor control
Circuit breakers are chosen by current and breaking capacity. Acti9 miniature circuit breakers (iC60, C120) protect final circuits up to 125 A. ComPacT NSX molded case breakers cover about 16 to 630 A, and the letter after the frame size sets the breaking capacity: B, F, N, H, S, L from lowest to highest. MasterPacT air circuit breakers are used as main incomers on large switchboards. For motors, a TeSys contactor with an LRD overload relay or a GV2 motor circuit breaker suits direct starting, an Altistart soft starter reduces starting current, and an Altivar drive controls speed. The breaking capacity must always be at least the prospective short-circuit current at the point of installation.
Where Schneider Electric products are used
In Oman and the GCC, Schneider Electric equipment is found in main and sub-main switchboards of commercial and residential buildings, motor control centres in water, oil and gas and industrial plants, substations protected by Sepam and Easergy relays, data centres powered by Galaxy and APC UPS systems, and buildings controlled by EcoStruxure Building Operation.
APC by Schneider Electric: UPS and critical power
Since 2007, APC has been part of Schneider Electric and is now its product brand for uninterruptible power supplies, replacement batteries, battery packs, network management cards and rack power distribution. Our APC catalogue covers Smart-UPS line-interactive and on-line models, Easy UPS On-Line, the modular Symmetra LX, RM and PX ranges, Silcon three-phase systems and their spare part kits, and the RBC cartridges that keep them running. Schneider Electric breakers, drives and PLCs can be quoted together with APC UPS systems in one request.
Schneider Electric products we list
| Family | Examples |
|---|---|
| Circuit breakers | Acti9 iC60N, C120N, NSX100F, NSX250N, NSX630, EasyPact EZC, MasterPacT MTZ1, MasterPacT NW |
| Motor control | TeSys Deca LC1D, TeSys F, LRD overload relay, GV2ME08, Altistart 22, Altistart 480 |
| Drives | Altivar 12, Altivar 320, ATV340, Altivar Process 630, ATV930, Lexium 32 servo |
| PLCs, HMIs and relays | Modicon M221, M241, M580 BMEP582040, Zelio Logic, Magelis HMISTU655 |
| Protection, metering and power | Sepam series 20, Easergy P3U30, MiCOM P139, PM5560, iEM3255, Galaxy VS UPS |
Ordering Schneider Electric products: what we need
Send the commercial reference from the label (for example LC1D18M7 or ATV320U22N4C). For breakers, confirm the rated current, number of poles, breaking capacity and trip unit. For contactors, give the coil voltage. For drives, give the motor power and supply voltage. APC products are listed on their own brand page.
Facts checked against Schneider Electric's published company history, October 2026.
Browse Schneider Electric products by category: Circuit Breaker, Electrical & Power Modules, AC Drives, PLC & I/O Cards, Metering Systems, UPS and Batteries.
FAQ
Questions about the Schneider Electric TM251MESE Modicon M251 Dual
Answers from our engineering team on installation, compatibility and integration.
01What is the net weight of the TM251MESE?
The datasheet gives 0.22 kg.
02What ingress protection does the TM251MESE list?
Stated as IP20 with protective cover in place.
03Which standards does the TM251MESE list?
Listed: 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.
04Which product range does the TM251MESE belong to?
The datasheet lists the range as Modicon M251.
05What are the dimensions of the TM251MESE?
The datasheet gives a width of 54 mm; see the table for height and depth.
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