Outline; Outline Of System - Mitsubishi FX3U Series User Manual

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
1.

Outline

This chapter outlines the MODBUS serial communication network.
1.1

Outline of System

The MODBUS serial communication network allows up to 16 slaves to be controlled by one master in
accordance with RS-485 to link devices, or one directly linked slave in accordance with RS-232C.
1) Up to 16 slaves can be controlled by one FX
2) Master and Slave functionality
3) RTU and ASCII mode
4) One channel per PLC can be used for MODBUS serial communication (1 MODBUS Master
channel or 1 MODBUS Slave channel)
5) Transmission speed up to 19.2 kbps
6) The MODBUS Master function uses a new PLC command dedicated to MODBUS serial
communication
In the case of RS-485
FX PLC
Master station
+
Communication
equipment operating
in accordance with
MODBUS RS-485
In the case of RS-232C
FX PLC
Master station
+
Communication
equipment operating
in accordance with
MODBUS RS-232
Note
MODBUS Slave Nodes do not need to be numbered in any specific order.
8
System
500 m (1640' 5")
FX PLC
Slave station No. 1 (01H)
+
Communication
equipment operating
in accordance with
MODBUS RS-485
15 m (49' 2")
FX PLC
Slave station No. 1 (01H)
+
Communication
equipment operating
in accordance with
MODBUS RS-232
MODBUS Master
3U
17 units
FX PLC
Slave station No. 16 (10H)
.......
+
Communication
equipment operating
in accordance with
MODBUS RS-485
1 Outline
1.1 Outline of System
Important points and reference
chapter/section
.......
Number of linked units
Total extension distance
.......
For the specifications,
refer to Chapter 2.
For applicable PLC models,
.......
refer to Section 1.3.
For selection, refer to
.......
Chapter 3.
For wiring, refer to
.......
Chapter 4.