Reserved Station Function - Mitsubishi Electric MELSEC-Q Series User Manual

8.3.4

Reserved station function

Slaved stations that are not actually connected (but will be connected in future) are not detected as "Data Link Faulty
Station" in the master station and local station.
By setting slave stations that will be connected in future as reserved stations, slave stations can be added without a
program change because the RX/RY/RWr/RWw assignment is not changed. In addition, the number of points of a
slave station that has been set as a reserved station can be set to zero points.
Master station
Data link cannot be performed with a station set as a reserved station.
(1) How to set the number of points of a reserved station to zero points
When a master station is in the remote net Ver.2 mode, the number of points of a reserved station can be set to
zero points. Use a programming tool to configure the setting.
The setting cannot be configured using a dedicated instruction. However, the setting can be configured by not
reading or writing data from/to a reserved station when cyclic data is refreshed using an intelligent function
module device (Un\G) or FROM/TO instructions.
(2) Setting method
Set a reserved station in "Station Information Setting" of the network parameter. (
(2))
162
Remote station Remote station
(the number of (the number of
occupied
occupied
stations: 2) stations: 1)
Station number 1 Station number 3
Stations that will be connected in the future
Local station
(the number of
occupied stations: 4)
Remote station
(Reserved station)
(the number of
Station number 4
stations: 2)
Station number 8
Remote station
(the number of
occupied
occupied
stations: 1)
(Reserved station)
Station number 10
Page 102, Section 7.3.2