Program Examples For Use In The Redundant System - Mitsubishi Electric Melsec Q Series User Manual

7
PROGRAMMING

7.9 Program Examples for Use in the Redundant System

This section explains program examples for the case where the QJ71PB92V is mounted in
a redundant system.
(1) Making a sequence program
Start command
device
Start command device data
are tracking-transferred.
ON for 1 scan only after switching
the system from standby to control
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- 67 7.9 Program Examples for Use in the Redundant System
The following explains the sequence program creation for the case where the
QJ71PB92V is mounted in a redundant system.
(a) Handling output signals of the QJ71PB92V
1) How to turn ON an output signal of the QJ71PB92V
An output signal of the QJ71PB92V is turned ON with the OUT instruction
using the start command device.
To keep each function enabled or re-executable
switching, tracking-transfer the start command device data.
Tracking transfer is not needed for output signals of the QJ71PB92V.
* 1 For whether or not each QJ71PB92V function can be continued or reexecuted in system switching,
refer to Sections 7.9.1 to 7.9.7.
Figure 7.26 How to Turn ON an Output Signal of the QJ71PB92V
2) Processing after system switching
Output signals of the QJ71PB92V are turned OFF in the timing of "ON for 1
scan only after switching system from standby to control" (SM1518). (This
prevents output signals of the QJ71PB92V from remaining ON in the new
control system after system switching.)
Turns OFF output signals of the QJ71PB92V.
(This is the case where output signals of QJ71PB92V are Y00 to Y1F)
Figure 7.27 Processing After System Switching
*1
Using the start command device, it
turns ON with the OUT instruction.
in the case of system
Output signal
of QJ71PB92V