Tracking Mode - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Tracking mode

The following two modes are available for tracking.
Item
Synchronous tracking mode
Asynchronous tracking mode
The tracking mode depends on the CPU module operating status.
CPU module operating status of standby system and control system
Control system
RUN
STOP, PAUSE
*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 systems are switched
• When tracking communications disabled is detected
Even if the safety operation mode is changed, the tracking mode will not change.
37 FUNCTIONS
632
37.2 Tracking Transfer
Description
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.
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.
Standby system
RUN
STOP, PAUSE
RUN
STOP, PAUSE
Tracking mode
*1
Synchronous tracking mode
Asynchronous tracking mode