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28 FUNCTIONS
28.2 System Switching
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When the cable for the network module is disconnected
If a network module cable is disconnected, the systems may not be switched depending on the timing of error detection on the
control system and the timing on the standby system.
In both case, replace the network module cable with a new one and clear the network error.
System switching during initial processing/initial processing (when switched to RUN)
When a system switching cause has been generated during initial processing or initial processing (when switched to RUN) on
the control system, the systems are switched after the initial processing or initial processing (when switched to RUN). Even if
the initial processing or initial processing (when switched to RUN) takes time and a communication error occurs, the systems
are switched after the initial processing or initial processing (when switched to RUN).
When a system switching cause has been generated during initial processing or initial processing (when switched to RUN) on
the standby system, whether the systems are switched or not depends on the system switching cause.
(1) When the control system detects cable disconnection first, the systems are switched.
(2) When the standby system detects cable disconnection first, the systems are not switched. At this time, a continuation error occurs on the control system
CPU module and the BACKUP LED flashes since a cause of the system switching failure has been generated.
System switching cause
Whether to switch the systems
Power-off, reset, hardware failure of the CPU module
The systems are switched after the initial processing or initial processing
(when switched to RUN).
Stop error of the CPU module
System switching request from a network module
The systems are not switched.
System switching request by the SP.CONTSW instruction
• In backup mode, the systems are not switched.
• In separate mode, the systems will be switched after the initial processing or
initial processing (when switched to RUN).
System switching request from the engineering tool
(1)
(2)
Control system
Standby system
Other station systems
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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