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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
Asynchronous tracking mode
STOP, PAUSE
Asynchronous tracking mode
STOP, PAUSE
RUN
STOP, PAUSE
Содержание MELSEC iQ-R-R00CPU
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Страница 151: ...9 MONITOR FUNCTION 9 1 Real Time Monitor Function 149 9 MEMO ...
Страница 323: ...18 SEQUENCE SCAN SYNCHRONIZATION SAMPLING FUNCTION 321 18 MEMO ...
Страница 330: ...328 20 ROUTING SETTING 20 3 Precautions MEMO ...
Страница 423: ...26 BASIC CONCEPT 26 8 State Transition of the Redundant System 421 26 MEMO ...
Страница 524: ...522 30 MAINTENANCE AND INSPECTION FOR A REDUNDANT SYSTEM 30 1 Module Replacement in the Redundant System MEMO ...
Страница 1009: ...APPX Appendix 14 List of Available SQL Commands for CPU Module Database Access Function 1007 A MEMO ...
Страница 1014: ...1012 APPX Appendix 15 Added and Enhanced Functions MEMO ...
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