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28 FUNCTIONS
28.3 Tracking Transfer
Tracking mode
The following two modes are available for tracking.
The tracking mode depends on the operation mode and the CPU module operating status.
*1 When the RUN/STOP/RESET switch of the CPU module of each system is set to the RUN position and both systems are powered on,
data is transferred in the asynchronous tracking mode at first. After the tracking data is reflected to the standby system, the mode is
switched to the synchronous tracking mode.
In the following conditions, the tracking mode is the asynchronous tracking mode.
• During an online change
• When the operation mode is switched
• When the systems are switched
• When tracking communications disabled is detected
Item Description
Synchronous tracking
mode
Tracking data is always transferred to the standby system once every scan of the control system. During a tracking transfer from the
control system to the standby system, the next scan does not start in the control system.
Asynchronous tracking
mode
When a tracking transfer from the control system is to be performed and the previous tracking is still in progress, the tracking
transfer from the control system is canceled and the previous tracking continues.
The control system starts the next scan without waiting for notifications of data reception/reflection completion from the standby
system.
Operating status of standby system and control system Operation mode
Control system Standby system Backup mode Separate mode
RUN RUN Synchronous tracking mode
*1
Asynchronous tracking mode
STOP, PAUSE Asynchronous tracking mode
STOP, PAUSE RUN
STOP, PAUSE
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