37 FUNCTIONS
37.1 System Switching
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*1 The operation varies in a program executed in both systems. ( Page 649 Operation at system switching)
*2 The safety program may be executed multiple times up until safety output is performed from the CPU module to the network module.
Local device setting (standard/safety program) This setting is in accordance with the parameter settings. No operation is performed because the program
does not operate.
*1
File register setting The file register setting before system switching is held.
Direct access input (DX) In the program execution after system switching, data is
fetched when an instruction using the direct access input
(DX) is executed.
Direct access output (DY) In the program execution after system switching, data is
output when an instruction using the direct access output
(DY) is executed.
FROM/TO instructions In the program execution after system switching, this
instruction is executed when the instruction execution
condition is satisfied.
No operation is performed because the program
does not operate.
*1
Instruction that requires several scans • This instruction is executed in the program execution
after system switching.
• When the systems are switched while the instruction is
being executed in a program executed in both
systems, the instruction execution continues and the
completion device turns on at a completion of the
instruction execution.
• No operation is performed because the
program does not operate.
*1
• When the systems are switched while the
instruction is being executed, the instruction
execution continues. However, the
completion device does not turn on in the new
standby system, and it turns on in the control
system after the next system switching.
*1
Constant scan Constant scan is enabled. Constant scan is disabled.
Item New control system CPU module New standby system CPU module
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