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4. HOW TO MONITOR REDUNTANT SYSTEM
4.10 Switch the Monitor Target to the Control System Using the Script Function
3. Set monitor screens.
For MELSECNET/H connection, MELSECNET/10 connection or Ethernet connection: (Common)
• Create a monitor screen with each object whose network setting is Station No. 1 on Screen No. 1 (1-1).
• Create a monitor screen with each object whose network setting is Station No. 2 on Screen No. 2 (1-2).
4. Change the screen switching device value in the script.
By selecting [Common] [Script] [Script], create a script for each monitor screen that checks the SM1515
status of the current monitor station, and if it is OFF (standby system), changes the station number switching device
value.
Set the trigger type of the script as [Ordinary] or [Sampling(about 3s)].
Screen scripts for MELSECNET/H connection and MELSECNET/10 connection:
The same script can be used for MELSECNET/H connection, MELSECNET/10 connection and Ethernet
connection.
HINTHINTHINT
When the MELSECNET/H network is connected to the redundant system only, SW56 (current control station) can
be set as the screen switching device.
In this case, even if the system switching occurs, the GOT always monitors the station number that is currently the
control station.
// Script of Screen No. 1
// If Station 1 is not a control station, the screen is changed to that of Station 2.
if([1-1:b:SM1515]==OFF){
[w:GD100]=2;
}
// Script of Screen No. 2
// If Station 2 is not a control station, the screen is changed to that of Station 1.
if([1-2:b:SM1515]==OFF){
[w:GD100]=1;
}
Script screen of Screen No. 1 Script screen of Screen No. 2