Mitsubishi Electric GOT2000 Series, Руководство по подключению, Страница: 251 / 1224

4.2 MELSEC Q Series
4 - 75
4
HOW T
O
MONIT
O
R REDUNT
ANT SYSTEM
4.2.9 Switch the Monitor Target to the Control System Using the Script
Function
The following explains how to create a script screen, to be used for the MELSECNET/H or MELSECNET/10 connection
(network system), or Ethernet connection, that automatically changes the monitoring target (Station No.) at the occurrence
of system switching even if the MELSEC redundant setting is not made.
The script executes the station number switching function or screen switching function.
The following shows the advantages and disadvantages of the station number switching function and screen switching
function.
The following explains how to use each function.
■1.
Method for using the station number switching function
• As a feature of this function, monitor screens for Station No. 1 (control system) and Station No. 2 (standby system)
can be created on one screen.
• If the system switching occurs, the GOT can change the monitoring target to the control system PLC CPU on the
same monitor screen.
• To achieve this, the script of the GOT monitors the special relay SM1515 (Control system identification flag) of the
PLC CPU and stores the station number of the latest control system into the station number switching device.
• Restrictions: Some objects do not allow the station number to be switched.
➠
GT Designer3 (GOT2000) Screen Design Manual
(1) Setting method (For MELSECNET/H connection, MELSECNET/10 connection)
System configuration example 1: MELSECNET/H connection, MELSECNET/10 connection
Function Advantage Disadvantage
Station number switching
function The monitor screens for Station No. 1 (control system) and
Station No. 2 (standby system) can be created on one screen.
Some objects do not allow the station number to be switched.
Screen switching function
All objects can be used since monitor screens are created for
each station number. Monitor screens must be created separately for Station No. 1
(control system) and Station No. 2 (standby system).
Connected module Network No. Station No.
MELSECNET/H network module of control system
1
1
MELSECNET/H network module of standby system 2
GOT connected to MELSECNET/H network or MELSECNET/10 network 3
MELSECNET/H
(MELSECNET/H mode or MELSECNET/10 mode)
Network No. 1
GOT
Station
No. 3
Control system
(System A)
Q25PRH
CPU
QJ71
BR11
Standby system
(System B)
Station No. 1
Q25PRH
CPU
QJ71
BR11
Station No. 2