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37 FUNCTIONS
37.2 Tracking Transfer
Tracking mode
The following two modes are available for tracking.
The tracking mode depends on 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 systems are switched
• When tracking communications disabled is detected
Even if the safety operation mode is changed, the tracking mode will not change.
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.
CPU module operating status of standby system and control system
Tracking mode
Control system
Standby system
RUN
RUN
Synchronous tracking mode
STOP, PAUSE
Asynchronous tracking mode
STOP, PAUSE
RUN
STOP, PAUSE
Summary of Contents for MELSEC iQ-R-R00CPU
Page 2: ......
Page 151: ...9 MONITOR FUNCTION 9 1 Real Time Monitor Function 149 9 MEMO ...
Page 323: ...18 SEQUENCE SCAN SYNCHRONIZATION SAMPLING FUNCTION 321 18 MEMO ...
Page 330: ...328 20 ROUTING SETTING 20 3 Precautions MEMO ...
Page 423: ...26 BASIC CONCEPT 26 8 State Transition of the Redundant System 421 26 MEMO ...
Page 1014: ...1012 APPX Appendix 15 Added and Enhanced Functions MEMO ...
Page 1027: ......