TM251MESE
Product ID:33935
Updated: 2026/7/15
Key Features
- 1Scale control seamlessly with 7 local and 14 remote I/O modules.
- 2Maximize uptime and reliability for critical automation applications.
- 3Integrate effortlessly with existing Modbus and Ethernet/IP networks.
- 4Reduce installation space using a compact, modular design.
- 5Simplify maintenance and lower lifecycle costs.
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Technical Specifications
Detailed engineering parameters
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| 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)<br />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 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 77 °F (25 °C) |
| Execution time for 1 KInstruction | 0.3 ms event and periodic task<br />0.7 ms other instruction | Application structure | 4 cyclic master tasks<br />8 event tasks<br />3 cyclic master tasks + 1 freewheeling task<br />8 external event tasks |
| Realtime clock | With | Clock drift | <= 60 s/month 77 °F (25 °C) |
| Integrated connection type | USB port mini B USB 2.0<br />Non isolated serial link serial RJ45 RS232/RS485<br />Dual-port Ethernet 1 RJ45<br />Ethernet port Ethernet 2 RJ45 | Supply | Serial)serial link supply 5 V, <200 mA |
| Transmission rate | 1.2...115.2 kbit/s (115.2 kbit/s by default) 49.2 ft (15 m) RS485<br />1.2...115.2 kbit/s (115.2 kbit/s by default) 9.8 ft (3 m) RS232<br />480 Mbit/s 9.8 ft (3 m) USB | Communication port protocol | USB port USB - SoMachine-Network<br />Non isolated serial link Modbus master/slave - RTU/ASCII or SoMachine-Network |
| Port Ethernet | Ethernet 1 10BASE-T/100BASE-TX - 2 copper cable<br />Ethernet 2 10BASE-T/100BASE-TX - 1 copper cable | Web services | Web server |
| Communication service | Downloading<br />IEC VAR ACCESS<br />Modbus TCP client<br />Modbus TCP server<br />Modbus TCP slave device<br />Monitoring<br />NGVL<br />Programming<br />Updating firmware<br />SMS notifications<br />DHCP client Eth1)<br />DHCP server Eth2)<br />Ethernet/IP originator Eth2)<br />Ethernet/IP target Eth1, Eth2)<br />Ethernet/IP scanner Eth2)<br />Modbus TCP I/O Scanner and Messaging Eth2)<br />FDR<br />FTP client/server<br />SNMP client/server<br />SQL client<br />Send and receive email from the controller based on TCP/UDP library<br />Web server (WebVisu & XWeb system)<br />OPC UA server<br />DNS client | Maximum number of connections | 8 Modbus server<br />8 Modbus client<br />16 Ethernet/IP target<br />4 FTP server<br />10 web server<br />8 SoMachine protocol |
| Number of server device(s) | 16 EtherNet/IP<br />64 Modbus TCP | Cycle time | 10 ms 16 EtherNet/IP<br />64 ms 64 Modbus TCP |
| Local signalling | for PWR 1 LED (green)<br /> for RUN 1 LED (green)<br /> for module error (ERR) 1 LED (red)<br /> for I/O error (I/O) 1 LED (red)<br /> for SD card access (SD) 1 LED (green)<br /> for BAT 1 LED (red)<br /> for SL 1 LED (green)<br /> for bus fault on TM4 (TM4) 1 LED (red)<br /> for Ethernet activity (ETH1) 1 LED (green)<br /> for Ethernet activity (ETH2) 1 LED (green) | Electrical connection | removable screw terminal block power supply pitch 5.08 mm) |
| Insulation | Non-insulated between supply and internal logic<br />Between supply and ground 500 V AC | marking | CE |
| Surge withstand | 1 kV shielded cable common mode IEC 61000-4-5<br />1 kV power lines common mode IEC 61000-4-5<br />0.5 kV power lines differential mode IEC 61000-4-5 | Mounting support | Top hat type TH35-15 rail IEC 60715<br />Top hat type TH35-7.5 rail IEC 60715<br /> plate or panel with fixing kit |
| Height | 3.5 in (90 mm) | Depth | 3.7 in (95 mm) |
| Width | 2.1 in (54 mm) | Net Weight | 0.49 lb(US) (0.22 kg) |
| Standards | ANSI/ISA 12-12-01<br />CSA C22.2 No 142<br />CSA C22.2 No 213<br />IEC 61131-2:2007<br />Marine specification (LR, ABS, DNV, GL)<br />UL 508 | Product Certifications | cULus<br />CE<br />UKCA<br />DNV-GL<br />ABS<br />LR |
| Resistance to electrostatic discharge | 8 kV in air IEC 61000-4-2<br />4 kV on contact IEC 61000-4-2 | Resistance to electromagnetic fields | 9.1 V/m (10 V/m) 80 MHz...1 GHz IEC 61000-4-3<br />2.7 V/m (3 V/m) 1.4 GHz...2 GHz IEC 61000-4-3<br />0.9 V/m (1 V/m) 2 GHz...3 GHz IEC 61000-4-3 |
| Resistance to fast transients | 2 kV IEC 61000-4-4 power lines)<br />1 kV IEC 61000-4-4 Ethernet line)<br />1 kV IEC 61000-4-4 serial link) | Resistance to conducted disturbances | 10 V 0.15...80 MHz IEC 61000-4-6<br />3 V 0.1...80 MHz Marine specification (LR, ABS, DNV, GL)<br />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) |
| Electromagnetic emission | Conducted emissions 120...69 dBµV/m QP power lines)10…150 kHz IEC 55011<br />Conducted emissions 63 dBμV/m QP power lines)1.5…30 MHz IEC 55011<br />Radiated emissions 40 dBμV/m QP class A 10 m)30…230 MHz IEC 55011<br />Conducted emissions 79...63 dBμV/m QP power lines)150…1500 kHz IEC 55011<br />Radiated emissions 47 dBμV/m QP class A 10 m)230…1000 MHz IEC 55011 | Immunity to microbreaks | 10 ms |
| Ambient air temperature for operation | 14…95 °F (-10…35 °C) vertical installation)<br />14…131 °F (-10…55 °C) horizontal installation) | Ambient Air Temperature for Storage | -13…158 °F (-25…70 °C) |
| Relative humidity | 10…95 %, without condensation in operation)<br />10…95 %, without condensation in storage) | IP degree of protection | IP20 with protective cover in place |
| Pollution degree | 2 | Operating altitude | 0...6561.68 ft (0...2000 m) |
| Storage altitude | 0.0000000000…9842.5 ft (0…3000 m) | Vibration resistance | 3.5 mm 5…8.4 Hz symmetrical rail<br />3 gn 8.4…150 Hz symmetrical rail<br />3.5 mm 5…8.4 Hz panel mounting<br />3 gn 8.4…150 Hz panel mounting |
| Shock resistance | 15 gn 11 ms |
Specifications may be subject to change without notice
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