Modicon M251

Logic controller

24 V DC

7 with local I/O architecture
14 with remote I/O architecture

20.4...28.8 V

<= 50 A

32.6...40.4 W with max number of I/O expansion module

8 MB program
64 MB system memory RAM

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

<= 32 GB SD card optional

BR2032 lithium non-rechargeable, battery life: 4 yr

2 years at 25 °C

0.3 ms event and periodic task
0.7 ms other instruction

0.022 µs

4 cyclic master tasks
8 external event tasks
3 cyclic master tasks + 1 freewheeling task
8 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; physical interface: RS232/RS485
Dual-port "Ethernet 1" with RJ45 connector
Ethernet port "Ethernet 2" with RJ45 connector

5 V at 200 mA serial link supply with "serial" marking

1.2...115.2 kbit/s (115.2 kbit/s by default) for bus length of 15 m - communication protocol: RS485
1.2...115.2 kbit/s (115.2 kbit/s by default) for bus length of 3 m - communication protocol: RS232
480 Mbit/s for bus length of 3 m - communication protocol: USB

USB port - USB protocol ; transmission frame: SoMachine-Network
Non isolated serial link - Modbus protocol ; transmission frame: RTU/ASCII or SoMachine-Network with master/slave method

"Ethernet 1" marking 10BASE-T/100BASE-TX - 2 port copper cable
"Ethernet 2" marking 10BASE-T/100BASE-TX - 1 port copper cable

Web server

FDR
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)
SNMP client/server
FTP 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

16 Ethernet/IP
64 Modbus TCP

64 ms with 64 slave(s) on Modbus TCP
10 ms with 16 slave(s) on Ethernet/IP

1 LED green for SD card access (SD)
1 LED red for BAT
1 LED green for SL
1 LED red for I/O error (I/O)
1 LED red for bus fault on TM4 (TM4)
1 LED green for Ethernet activity (ETH1)
1 LED green for Ethernet activity (ETH2)
1 LED red for module error (ERR)
1 LED green for PWR
1 LED green for RUN

Removable screw terminal block for power supply with pitch 5.08 mm adjustment

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

CE

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

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

cULus
CSA

4 kV (on contact) conforming to EN/IEC 61000-4-2
8 kV (in air) conforming to EN/IEC 61000-4-2

10 V/m (80 MHz...1 GHz) conforming to EN/IEC 61000-4-3
3 V/m (1.4 GHz...2 GHz) conforming to EN/IEC 61000-4-3
1 V/m (2 GHz...3 GHz) conforming to EN/IEC 61000-4-3

1 kV (Ethernet line) conforming to EN/IEC 61000-4-4
1 kV (serial link) conforming to EN/IEC 61000-4-4
2 kV (power lines) conforming to EN/IEC 61000-4-4

10 V (0.15...80 MHz) conforming to EN/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)

Conducted emissions - test level: 120...69 dBµV/m QP (power lines) at 10...150 kHz conforming to EN/IEC 55011
Conducted emissions - test level: 63 dBμV/m QP (power lines) at 1.5...30 MHz conforming to EN/IEC 55011
Radiated emissions - test level: 40 dBμV/m QP class A (10 m) at 30...230 MHz conforming to EN/IEC 55011
Conducted emissions - test level: 79...63 dBμV/m QP (power lines) at 150...1500 kHz conforming to EN/IEC 55011
Radiated emissions - test level: 47 dBμV/m QP class A (10 m) at 230...1000 MHz conforming to EN/IEC 55011

10 ms

-10...55 °C horizontal installation
-10...35 °C vertical installation

-25...70 °C

10...95 % without condensation in operation
10...95 % without condensation in storage

IP20 with protective cover in place

2

0...2000 m

0...3000 m

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

15 gn during 11 ms