Return Bus Message Count (Sub-Function Code: 0Bh) - Mitsubishi Electric MELSEC iQ-R Series Reference Manual

Return bus message count (sub-function code: 0BH)

Operation description
Reads out the number of messages detected on the line 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 Sub-function code
08H
(H)
Returns the count value of the buffer memory listed below to the master.
• 'Bus message count' (Un\G32512/Un\G32576)
Refer to the following for the counter descriptions, count range, and count clear methods.
Page 21 Checking communication conditions using a diagnostic counter
■ When completed with an error
Function code Data
Exception code
88H
3 MODBUS STANDARD FUNCTION DETAILS
28
3.8 Diagnostics (FC: 08H)
(000BH)
(L) (H)
Bus message count value
(000BH) (0000H to FFFFH)
(L) (H)
Data
(0000H)
(L)
Data
(L)