Restart Communications Option (Sub-Command Code: 0X01) - Mitsubishi FX3U Series User Manual

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

7.11.2 Restart communications option (sub-command code: 0x01)

Initializes the communication port of the receiving channel side and restarts the slave function.
Restart is performed after returning the response message corresponding to a request
message.
The operation status returns to online mode when it was in the listen only mode.
The following data are cleared when executing the restart communications option.
• Event and Error counter (Refer to Chapter 6)
• Communications event log (Refer to Section 9.5)
*1. Clears the data when the communications event log clear is specified in the request message.
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.
However, if a request message is received during listen only mode, the status will only return to online
mode and no response message will be returned.
(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.
58
Function code Sub-function code
Function
Sub-function code
code
(0001
(08 )
H
(H)
Function code
Function
code
(88
*1
Data
Clear setting of
Communications event log
)
H
0000 : Do not clear
H
FF00 : Clear
H
(L)
(H)
Data
Exception
code*
2
)
H
7 MODBUS Standard Commands
7.11 Diagnostics (Command Code: 0x08)
(L)