Transient Transmission Of When The Submaster Function Is Used; Switch From The Master Station To The Submaster Station - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

Transient transmission of when the submaster function is used

In transient transmission, communications can be performed with other stations when requests are issued using dedicated
instructions. Communications with different networks is also possible. Transient transmission can be performed from either
the master station or submaster station. (Note, however, that the REMFR, REMTO, REMFRD, and REMTOD instructions can
be executed only from the master operating station.)
For details on dedicated instructions, refer to the following.
 MELSEC iQ-R Programming Manual (Instructions, Standard Functions/Function Blocks)
Ex.
Accessing a programmable controller of another station from a local station or submaster station using the dedicated
instruction (READ instruction)
Master operation
CPU module Master station
1
Command
READ
3
Device
1234H

Switch from the master station to the submaster station

This section describes conditions where the master operating station is switched to the submaster operating station.
Automatic switch
The control is switched under one of the following conditions.
Condition
Disconnection of the master station (master operation)
Return of the disconnected master station (This applies when "Return as
Master Operation Station" is selected in "Operation of Master Station after
Reconnection" under "Basic Settings".)
*1 When "Return as Sub-master Operation Station" is selected, the submaster station continues to be in control, and the master station
returns as a submaster operating station. When the submaster station (master operation) is disconnected after return, the master station
operates as a master operating station.
*1
Local station or CPU module
submaster station
2
Device
Description
If an error occurs in the master station while the master station is operating as
a master operating station and the submaster station as a submaster
operating station, the submaster station starts to take in control.
The control is switched when the disconnected master station returns while
the submaster station is operating as a master operating station.
Submaster
operation
1234H
1 FUNCTIONS
1.6 Submaster Function
1
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