Checking Setting Contents And Errors - Mitsubishi FX3U Series User Manual

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
2. Communication setting using parameters
Verify that the communication setting parameters are suitable for use. If the communication setting
parameters are not suitable for use, communication will not function correctly. After changing any setting,
make sure to reboot the PLC's power.
3. Presence of RS or RS2 instructions
Verify that neither the RS nor RS2 instructions are being used on the same channel as the MODBUS
communication.
If either instruction is being used on the same channel, delete it, and then reboot the PLC's power.
4. Presence of IVCK, IVDR, IVRD, IVWR, and IVBWR instructions
Verify that none of the dedicated Inverter communication instructions are being used on the same channel as
the MODBUS communication.
If any of the instructions are being used on the same channel, delete it, and then reboot the PLC's power.
12.5

Checking Setting Contents and Errors

1. Checking the setting contents
Each FX PLC has devices for checking the communication settings. Verify that the correct contents are
stored in the devices shown in the table below.
Device
D8400
D8401
D8409
D8410
D8411
D8412
D8414
D8415
D8416
104
→ For the MODBUS communication settings, refer to Chapter 5.
Name
Channel 1 MODBUS
Communication Format
Channel 1 MODBUS
Protocol
Channel 1 MODBUS
Slave ResponseTimeout
Channel 1 MODBUS
Turn Around Delay
Channel 1 MODBUS
Message to Message Delay
Channel 1 MODBUS
Number of Retries
Channel 1 MODBUS
Slave Node Address
Channel 1 MODBUS
Communication Status
Information Setup
Channel 1 MODBUS
Communication Status
Device Range Setup
12.5 Checking Setting Contents and Errors
Description
For Descriptions, refer to Chapter 6.
12 Troubleshooting