Return Diagnostic Register (Sub-Function Code: 02H) - Mitsubishi Electric MELSEC iQ-R Series Reference Manual

Return diagnostic register (sub-function code: 02H)

Operation description
Reads out the detailed LED status of C24 to the master.
Request message format (from master to slave)
Function code Sub-function code
08H
(H)
Response message format (from slave to master)
■ When completed successfully
Function code
08H
b15 b14 b13 b12 b11
0 0 0 1/0 1/0 1/0
In the C24, the detailed LED status of 'CH1/2 side LED lighting status and communication error status' of the buffer memory
(Un\G513/Un\G514) is stored as the diagnostic register.
■ When completed with an error
Function code Data
Exception code
88H
3 MODBUS STANDARD FUNCTION DETAILS
24
3.8 Diagnostics (FC: 08H)
(0002H)
(L) (H)
Sub-function code
(0002H)
(H) (L)
b10 b9 b8 b7 b6 b5
1/0 1/0 0 0 0
Data
(0000H)
(L)
Data
Diagnostic register value
(H) (L)
b4 b3 b2 b1 b0
1/0 1/0 1/0 1/0 1/0
CH1 C/N
CH1 P/S
CH1 PRO.
CH1 SIO
CH1 ERR.
Unused (Fixed to 0)
CH2 C/N
CH2 P/S
CH2 PRO.
CH2 SIO
CH2 ERR.
Unused (Fixed to 0)
CH1 side Detailed
LED status
(0: OFF, 1: ON)
CH2 side Detailed
LED status
(0: OFF, 1: ON)