Presentation, description, schemes
Modicon M221, M221 Book, M241 and M251 logic controllers
Modbus protocols, character mode
RS 232/RS 485 serial links offer a simple solution to the communication needs of compact machines. Modbus and ASCII standard communication protocols are used to connect numerous equipment items such as: HMIs, printers, energy meters, variable speed drives, motor starters, remote I/O (RIO), etc. Thanks to the I/O Scanner function, this equipment is just as easy to integrate into the application as the local I/O.
b Modicon M221 Book logic controllers with 16, 24 or 40 I/O have the following on the front panel: 1 A serial link port with an RJ 45 connector delivering a voltage of 5 V (200 mA) to supply an HMI or Bluetooth adapter with power. 2 A slot for a 2
serial link port (with connection on screw terminals) by inserting the TMC2SL1 communication cartridge or the TMC2CONV01 application cartridge (1) . b Modicon M221 Book logic controllers with 16 or 32 I/O have the following on the front panel: 3 A serial link port with an RJ 45 connector delivering a voltage of 5 V (200 mA) to supply an HMI or Bluetooth adapter with power 4 A 2
serial port also equipped with an RJ 45 connector for TM221M16 pp and TM221M32 pp controllers (controllers without embedded Ethernet).
Controller Type Embedded Ports Optional Port (1 max. per controller) Serial or Serial 1 port, RJ 45 connector Serial 2 port, RJ 45 connector On TMC2SL1 or TMC2CONV01 option cartridges, connection on screw terminals TM221C pppp RS 232/RS 485 with 5 V (200 mA) power supply for HMI or Bluetooth communication adapter (items
1 / 3
) RS 232/RS 485 (item
) TM221M pppp RS 485 (item
) TM221ME pppp (1) TM221C40 pppp controllers have 2 slots for a cartridge; only one cartridge, TMC2SL1 or TMC2CONV01, can be used per controller. The other slot remains available for an analog I/O cartridge or an application cartridge.
1 2 4 3
TM221M16 pp TM221M32 pp TM221M E pppp TM221C pppp
Modbus serial link wiring system
Non-isolated bus Isolated bus (recommended for bus > 10 m/32.808 ft) 1
6 3 6 4 2 4 2 4
c 5 V
g b b
- Total length of cables between M221 and ATV 12: y 30 m (98.425 ft) - Length of cable 4 : y 10 m (32.808 ft)
Line polarization active.
Line termination - Total length of cables between isolation boxes 1 : y 1,000 m (3,280.840 ft) - Length of drop cables 4 or 5 : y 10 m (32.808 ft)
Line polarization active.
Line termination (1) Box powered by the logic controller. Master M221C Master M221M TeSys U Altivar 12 Altivar 312 Slave M221C Phaseo power supply Power meter HMI (XBTN) HMI (HMISCU) OTB 3rd-party Modbus slave
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