Return Diagnostic Register (Sub-Command Code: 0X02) - Mitsubishi FX3U Series User Manual

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

7.11.3 Return diagnostic register (sub-command code: 0x02)

Reads out the diagnostic register of the remote node to the master.
1) Request message format (Master → Slave)
2) Response message format (Slave → Master)
(When completed normally)
Function code
Function
code
(08 )
H
*1. When using 3rd party products. The high byte (H) does not equal 00H. For further information on the
specifications for the slave refer to Chapter 9.
(When completed with an error)
*2. Exception and error codes are stored in special data registers and special auxiliary relays in the case
of error completion. Refer to Chapter 6 for storage location, confirmation methods, and other detailed
contents.
Function code Sub-function code
Function
Sub-function code
code
(0002
(08 )
H
(H)
Sub-function code
Sub-function code
(0002 )
H
(H) (L)
00
(FX
Function code
Function
code
(88
7.11 Diagnostics (Command Code: 0x08)
Data
(0000 )
) H
H
(L)
(H)
Data
Diagnostic register
value
(L)
(H)
M8060-M8067
H
(When using CH1 for MODBUS communication)
*1
)
3U
M8060-M8062,M8438, M8064-M8067
(When using CH2 for MODBUS communication)
Data
Exception
code*
2
)
H
7 MODBUS Standard Commands
(L)
1
2
3
4
5
6
7
8
9
10
59