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37 FUNCTIONS
37.1 System Switching
Manual system switching
The user can manually switch the systems between the control system and the standby system.
• After turning on SM1646 (System switching by a user), perform the manual system switching in the control
system.
• When the manual system switching is disabled by the DCONTSW instruction, execute the ECONTSW
instruction. The system switching is enabled in the initial status.
■
System switching by the SP.CONTSW instruction
When the SP.CONTSW instruction is executed on the control system CPU module, the systems are switched at the END
processing after the instruction execution.
Ex.
Operation of system switching by using the SP.CONTSW instruction
Once the devices and labels specified in "Tracking Setting" are transferred, the CPU modules in both of the
control system and standby system have the same specified devices and labels. Thus, if the systems are
switched by using the SP.CONTSW instruction on the control system CPU module, switching may also be
performed on the new control system CPU module.
When the SP.CONTSW instruction is used, create a program that does not execute the SP.CONTSW
instruction again on the new control system CPU module by using SM1643 (ON for only one scan after
system switching (standby system to control system)), as shown below.
M1000: System switching command, M1001: Clear signal
For details on the SP.CONTSW instruction, refer to the following.
MELSEC iQ-R Programming Manual (CPU Module Instructions, Standard Functions/Function Blocks)
END
Program executed
Execution of the SP.CONTSW instruction
System A
System B
System switching
Standby system
Program stopped
Program executed
Control system
Control system
Program stopped
Standby system
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 ...
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