Program Example For Global Control Function - Mitsubishi Electric Melsec Q Series User Manual

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PROGRAMMING

7.9.3 Program example for global control function

If a system switching occurs during execution of the global control function, the processing
cannot be continued.
This section explains a program example for reexecuting the global control function in the
case of system switching.
(1) Device assignments in program example
(a) Devices used by the QJ71PB92V
(b) Devices used by the user
Device
X25 Global control execution command
M0
Refresh start request (
(2) Tracking devices for reexecuting the function after system switching
Data in the following devices are tracking-transferred:
Table7.75 Tracking Transfer Devices in the Program Example for the Global Control Function
Device
X25 Global control execution command
(3) Program example
Program for global control (
The devices are the same as those in Section 7.3 (1) (a).
Table7.74 List of User Devices
Description
Section 7.9.1)
• Start command device by which the Global control request signal (Y04) is turned
ON
• Start command device to which global control request data are set
Description
If system switching occurs with Global control execution
command (X25) ON, the global control may be reexecuted after
the system switching.
To prevent reexecution, perform the following before Global
control request signal (Y04) turns ON in the new control system.
Section 7.3
Figure 7.38 Program Example for Global Control Function
7.9 Program Examples for Use in the Redundant System
7.9.3 Program example for global control function
Device
ON for 1 scan only after switching system from
SM1518
standby to control
Device
)
Description
Description
Reexecution is prevented
when system switching
occurred.
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