Communication Setup; Setup Method For Modbus Serial Communication; Example Of Communication Setup - Mitsubishi FX3U Series User Manual

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
5.

Communication Setup

This chapter explains the setup method for using the MODBUS protocol with an FX
Communication ADP.
5.1

Setup method for MODBUS serial communication

MODBUS communication is setup via the PLC program using GX Developer.
5.2

Example of communication setup

To initiate the setup, the PLC program must use the auxiliary relay M8411 for Channel 1 or Channel 2. When
the PLC program contains the "LD M8411" instruction, it is then possible to configure the MODBUS
functionality using MOV operations.
The communication parameters for MODBUS communication can be setup using the following ladder code:
Parameters for a Master using Channel 1:
Device
D8400
D8401
D8409
D8410
D8411
D8412
D8415
D8416
Name
Communication Format
Protocol
Slave Response Timeout
Turn Around Delay
Message to Message Delay
Number of Retries
Communication Status Information Setup
Communication Status Device Range Setup
5 Communication Setup
5.1 Setup method for MODBUS serial communication
3U
Description
For Descriptions, refer to Chapter 6.
1
2
PLC and MODBUS
3
4
5
6
7
8
9
10
27