4.10Switch 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 Q 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.
Function | Advantage | Disadvantage | |
Station number switching | The monitor screens for Station No. 1 (control system) | Some objects do not allow the station number to be | |
and Station No. 2 (standby system) can be created on one | |||
function | switched. | ||
screen. | |||
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| All objects can be used since monitor screens are created | Monitor screens must be created separately for Station | |
Screen switching function | No. 1 (control system) and Station No. 2 (standby | ||
for each station number. | |||
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The following explains how to use each function.
4.10.1Method 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 Version
Screen Design Manual
Setting method (For MELSECNET/H connection, MELSECNET/10 connection)
System configuration example 1: MELSECNET/H connection, MELSECNET/10 connection
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| MELSECNET/H |
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Control system |
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Q25PRH |
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(System A) | CPU |
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| Connected module |
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MELSECNET/H network module of control system |
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MELSECNET/H network module of standby system |
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GOT connected to MELSECNET/H network or MELSECNET/10 |
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1
PREPARATORYFORPROCEDURESMONITORING 2
RANGESETBE
DEVICE CANTHAT 3
RANGEACCESS MONITORINGFOR 4
MONITORTOREDUNTANTSYSTEM HOW 5
CONNECTIONBUS 6
DIRECTTOCONNECTIONCPU 7
LINKCOMPUTER CONNECTION 8
ETHERNETCONNECTION
4. HOW TO MONITOR REDUNTANT SYSTEM | 4 - 31 |
4.10 Switch the Monitor Target to the Control System Using the Script Function