User`s manual

106
FX3U Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
12 Troubleshooting
12.6 MODBUS Error Code List
2) Error codes
When a communication error occurs while using MODBUS communication, the corresponding
communication error flag turns ON, and the MODBUS error code is stored in the corresponding data
register.
→ For the MODBUS Error Code List, refer to Section 12.6.
12.6 MODBUS Error Code List
Note
Only one channel can be used for MODBUS serial communication.
Device Name Description
D8063 Serial Communication Error Code 1 (ch1) Set to 6321, representing MODBUS Error on ch1.
D8402 MODBUS Communication Error Code on ch1 Set to corresponding MODBUS Error Code on ch1.
D8403
MODBUS Communication Error Details on
ch1
Set to Error Details for MODBUS Error Code in
D8402.
D8422 MODBUS Communication Error Code on ch2 Set to corresponding MODBUS Error Code on ch2.
D8423
MODBUS Communication Error Details on
ch2
Set to Error Details for MODBUS Error Code in
D8422.
D8438 Serial Communication Error Code 2 (ch2) Set to 3821, representing MODBUS Error on ch2.
MODBUS
Error
Code
Error Name and Details
Master
/ Slave
Related Devices:(M & D) Corrective Action
0201
Invalid Hardware Setup
Failed to detect MODBUS communication
adapter
Details:
Channel number 1 or 2
Master
/ Slave
CH1: M8063 set to ON
D8063 set to 6321
M8402 set to ON
D8402 set to
MODBUS Error
Code
M8403 set to ON
D8403 set to Error
Details
CH2: M8438 set to ON
D8438 set to 3821
M8422 set to ON
D8422 set to
MODBUS Error
Code
M8423 set to ON
D8423 set to Error
Details
Verify that the
MODBUS Special
Adapters are being
used
(FX
3U-485ADP-MB,
or FX
3U-232ADP-MB)
0202
Invalid Parameter Setup
MODBUS communication parameter settings
are invalid
Details:Special D register (Device Address)
causing the error code
e.g. Invalid slave number channel 1: Details
(D) 8414
Master
/ Slave
See above
Invalid Parameter
values will not be
entered into the
corresponding data
registers.
Check MODBUS
configuration program
block.
0203
Channel Double Use
Single channel used for more than one type
of communication
(i.e. MODBUS and N:N Networking
configured for the same channel)
Master
/ Slave
See above
Make sure only one
Channel is setup for
MODBUS Serial
Communication.