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Mitsubishi Electric Melsec Q Series User Manual page 258

Profibus-dp master module
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7
PROGRAMMING
Figure 7.29 Processing of the QJ71PB92V in the Control System (Before System Switching)
ON for 1 scan only after switching
the system from standby to control
Figure 7.30 Processing of the QJ71PB92V in the New Control System (After System Switching)
7
- 69
7.9 Program Examples for Use in the Redundant System
2) Keeping output data
To keep output data after system switching, perform the following.
• Processing of the QJ71PB92V in the control system (Before system
switching)
Write the output data to the Output data area (Un\G14336 to Un\G18431)
using devices.
Tracking-transfer the output data stored in the devices.
Output data are written to Output data area
(Un\G14336 to Un\G18431) using devices.
Output data stored in the devices are tracking-transferred.
Remark
(1) Figure 7.29 is an example for using a dedicated instruction.
(2) When using the automatic refresh, output data in the specified auto-refresh
target devices are tracking-transferred.
• Processing of the QJ71PB92V in the new control system (After system
switching)
The tracking-transferred output data are written to the Output data area
(Un\G14336 to Un\G18431) in the timing of "ON for 1 scan only after
switching system from standby to control" (SM1518). (This processing is
not needed when the automatic refresh is used.)
Tracking-transferred output data are written
to Output data area (Un\G14336 to Un\G18431).

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