Mitsubishi FX3U Series User Manual page 109

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
Device
Channel 2 MODBUS
D8420
Communication Format
D8421 Channel 2 MODBUS Protocol
Channel 2 MODBUS
D8429
Slave Response Timeout
Channel 2 MODBUS
D8430
Turn Around Delay
Channel 2 MODBUS
D8431
Message to Message Delay
Channel 2 MODBUS
D8432
Number of Retries
Channel 2 MODBUS
D8434
Slave Node Address
Channel 2 MODBUS
D8435 Communication Status
Information Setup
Channel 2 MODBUS
D8436 Communication Status
Device Range Setup
If the correct contents are not stored in the above devices, check the sequence program.
2. Checking for setting errors
1) Error flags
If the parameter settings include an error, the serial communication error flag and the MODBUS
communication error flag turn ON.
Verify that the devices shown in the table below are OFF.
Device
M8063 Serial Communication Error 1 (ch1)
M8402 MODBUS Communication Error on ch1
MODBUS Communication Error on ch1
M8403
(Latched)
M8422 MODBUS Communication Error on ch2
MODBUS Communication Error on ch2
M8423
(Latched)
M8438 Serial Communication Error 2 (ch2)
Name
Name
Turns ON when abnormality occurs using serial
communication on ch1.
Turns ON when a MODBUS command error occurs
using ch1.
Turns ON after a MODBUS command error has
occurred using ch1.
Turns ON when a MODBUS command error occurs
using ch2.
Turns ON after a MODBUS command error has
occurred using ch2.
Turns ON when abnormality occurs using serial
communication on ch2.
12 Troubleshooting
12.5 Checking Setting Contents and Errors
Description
For Descriptions, refer to Chapter 6.
Description
11
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