Clear Counters And Diagnostic Register (Sub-Command Code: 0X0A) - Mitsubishi FX3U Series User Manual

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

7.11.6 Clear counters and diagnostic register (sub-command code: 0x0A)

Clears counters (e.g. message count).
The following counters will be cleared. (Refer to Chapter 6)
• Bus message count
• Bus communication error count
• Exception error count
• Slave message count
• Slave no-response count
• Slave NAK count
• Slave busy count
• Character overrun error count
• Communications event count (Refer to Section 7.12)
The FX bit devices displayed in the diagnostic register are not reset, so the diagnostic register will be
3U
overwritten in the next scan by the actual state of the error flags. The error flags can be reset by PLC program
or monitoring device.
1) Request message format (Master → Slave)
2) Response message format (Slave→ Master)
(When completed normally)
The slave returns the request message received from the master without change.
(When completed with an error)
*1. 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.
62
Function code
Sub-function code
Function Sub-function code
code (000A
(08 )
H
(H)
Function code
Function
code
(88
Data
(0000
)
H
(L)
(H)
Data
Exception
code*
1
)
H
7 MODBUS Standard Commands
7.11 Diagnostics (Command Code: 0x08)
)
H
(L)