Modicon M251 Plc Page 14 Communication bus

14 Presentation RS 232/RS 485 serial links offer a simple solution to the communication needs of 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. Description 2 1 Modicon M241 logic controllers have the following on their upper surface: 1 A Serial 1 serial link port with an RJ45 connector delivering a 5 V/200 mA power supply which allows the use of a Magelis HMI, the Bluetooth communication adapter or other devices. 2 A 2nd Serial 2 serial link port (with connection on screw terminals). Controller Type Embedded Ports Serial 1 port, RJ45 connector Serial 2 port, connection on screw terminals TM241 pppp RS 232/RS 485 with 5V (200 mA) power supply for HMI or Bluetooth communication adaptor (item 1 ) RS 485 (item 2 ) 3 Modicon M251 logic controllers have on their front a serial link port with an RJ45 connector delivering a 5 V/200 mA power supply which allows the use of a Magelis HMI, the Bluetooth communication adapter or other devices. 3 A serial link port (RJ 45 connector (RS 232 or RS 485). Modbus serial link wiring system Non-isolated bus Isolated bus (recommended for bus > 10 m (32.808 ft) HMISCU 1 5 4 1 4 3 5 4 2 4 2 4 ON Imax: 63A iEM31 C/- DI N.C. C DO N.C. 0V D1/+ D0/- 5 5 V c 6 SL1 SL2 SL1 SL2 - Total length of cables between M241/M251 and ATV12: y 30 m (98.425 ft) - Length of cable 4 : y 10 m (32.808 ft) g Line polarization active. b Line termination - Total length of cables between isolation boxes 1 : y 1000 m (3280.840 ft) - Length of drop cables 4 or 5 : y 10 m (32.808 ft) g Line polarization active. b Line termination (1) Box powered by the logic controller. g b b g b (1) b (1) Master M241 / M251 TeSys U Altivar 12 Altivar 312 Slave M221C Phaseo power supply Power meter XBTN OTB 3rd-party Modbus slave References Tap-off and adaptor components for RS 485 serial link Designation Description Item Length m / ft. Unit reference Weight kg lb T-junction and isolation box Screw terminals for trunk cable 2 x RJ45 for tap-off v Isolation of the RS 485 link (1) v Line termination (RC 120 & , 1nF) v Line pre-polarization (2 R 620 & ) v 24 V c power supply (screw terminals) or 5 V c power supply (via RJ45) v Mounting on 35 mm (1.378 in.) 5 1 TWDXCAISO 0.100 0.220 T-junction box 1 x RJ45 for trunk cable 2 x RJ45 for tap-off v Line termination (RC 120 & , 1nF) v Line pre-polarization (2 R 620 & ) v Mounting on 35 mm (1.378 in.) 5 2 TWDXCAT3RJ 0.080 0.176 (1) Line isolation recommended for line distances > 10 m (32.808 ft). Modicon M251 logic controllers Serial links Modbus protocols, character mode Presentation, description, schemes, references TWDXCAISO TWDXCAT3RJ 1 2 3 4 5 6 7 8 9 10

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