Modicon M251

Logic controller

24 V DC

7 (local)
14 (remote)

20.4…28.8 V

50 A

32.6…40.4 W (with max number of I/O expansion module)

8 MB for program
64 MB for system memory RAM

128 MB built-in flash memory for backup of user programs

<= 16 GB SD card (optional)

BR2032 lithium non-rechargeable, battery life: 4 year(s)

2 years at 25 °C

0.3 ms for event and periodic task
0.7 ms for other instruction

0.022 µs

3 cyclic master tasks + 1 freewheeling task
8 event tasks
4 cyclic master tasks
8 external event tasks

With

<= 60 s/month at 25 °C

USB port with mini B USB 2.0 connector
Non isolated serial link serial with RJ45 connector and RS232/RS485 interface 
Dual-port Ethernet with RJ45 connector
CANopen J1939 with SUB-D 9 connector

(serial)serial link supply: 5 V, <200 mA

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

USB port: USB - SoMachine-Network
Non isolated serial link: Modbus master/slave - RTU/ASCII or SoMachine-Network

Ethernet marking 10BASE-T/100BASE-TX - 2 copper cable

Web server

DHCP client
Downloading
Ethernet/IP slave device
IEC VAR ACCESS
Modbus TCP client
Modbus TCP server
Modbus TCP slave device
Monitoring
NGVL
Programming
Updating firmware
SMS notifications
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

8 Modbus server
8 Modbus client
16 Ethernet/IP target
4 FTP server
10 web server
8 SoMachine protocol

DR 303-1
DS 301 V4.02

63 CANopen:

1 LED (green)PWR: 
1 LED (green)RUN: 
1 LED (red)module error (ERR): 
1 LED (red)I/O error (I/O): 
1 LED (green)SD card access (SD): 
1 LED (red)BAT: 
1 LED (green)Ethernet port activity: 
1 LED (green)SL: 
1 LED (red)bus fault on TM4 (TM4): 
1 LED (green)CANopen run: 
1 LED (green)CANopen error:

removable screw terminal blockpower supply (pitch 5.08 mm)

Non-insulated between supply and internal logic
Between supply and ground at 500 V AC

CE

1 kV shielded cable common mode conforming to EN/IEC 61000-4-5
1 kV power lines common mode conforming to EN/IEC 61000-4-5
0.5 kV power lines differential mode conforming to EN/IEC 61000-4-5

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

90 mm

95 mm

54 mm

0.22 kg

ANSI/ISA 12-12-01
CSA C22.2 No 142
CSA C22.2 No 213
EN/IEC 61131-2:2007
Marine specification (LR, ABS, DNV, GL)
UL 1604
UL 508