Logic Controller, MoDiCon M251, 2x Ethernet.
| Specifications | TM251MESE | 
| 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)
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| 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) | 
| 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
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| Supply | (Serial)serial link supply: 5 V, <200 mA | 
| Communication port protocol | USB port: USB - SoMachine-Network Non isolated serial link: Modbus master/slave - RTU/ASCII or SoMachine-Network
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| Port Ethernet | Ethernet 1 marking 10BASE-T/100BASE-TX - 2 copper cable Ethernet 2 marking 10BASE-T/100BASE-TX - 1 copper cable
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| 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
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| Maximum number of connections | 8 Modbus server 8 Modbus client
 16 Ethernet/IP target
 4 FTP server
 10 web server
 8 SoMachine protocol
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| Number of server device(s) | 16 EtherNet/IP: 64 Modbus TCP:
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| Height | 90 mm | 
| Depth | 95 mm | 
| Width | 54 mm | 
| Net weight | 0.22 kg |