Selecting Connection Method; For Communication In Accordance With Modbus Rs-232C (1-To-1 Connection); For Communication In Accordance With Modbus Rs-485 (1-To-N Connection) - Mitsubishi FX3U Series User Manual

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
4.2

Selecting Connection Method

When using MODBUS serial communication, communication can be achieved in accordance with MODBUS
RS-232C or RS-485. For the FX
Master or Slave.
4.2.1

For communication in accordance with MODBUS RS-232C (1-to-1 connection)

For communication in accordance with MODBUS RS-232C, 1-to-1 connection is possible. Make sure that the
total extension distance is 15m (49'2") or less.
4.2.2

For communication in accordance with MODBUS RS-485 (1-to-N connection)

For communication in accordance with MODBUS RS-485, up to 16 PLC Slave Nodes can be connected to
one Master Node. Make sure that the total extension is 500m (1640'5") or less.
FX PLC
Master station
+
Communication
equipment operating
in accordance with
MODBUS RS-485
Note
MODBUS Slave Nodes do not need to be numbered in any specific order.
, only one channel can be used for MODBUS serial communication,
3U
FX PLC
Master station
+
Communication
equipment operating
in accordance with
MODBUS RS-232C
15 m (49' 2")
FX PLC
Slave station No. 1 (01H)
+
Communication
equipment operating
in accordance with
MODBUS RS-485
500 m (1640' 5")
FX PLC
Slave station No. 1 (01H)
+
Communication
equipment operating
in accordance with
MODBUS RS-232C
FX PLC
Slave station No. 16 (10H)
.......
+
Communication
equipment operating
in accordance with
MODBUS RS-485
4 Wiring
4.2 Selecting Connection Method
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