When The Operation Mode Is Switched To The Backup Mode; Precautions For Using The Annunciator (F) - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

When the operation mode is switched to the backup mode

For the control system
When the interrupt programs of the interrupt factors before switching to the backup mode have not been executed yet, the
control system will execute the programs that the system has retained in the separate mode.
For the standby system
When the interrupt programs of the interrupt factors before switching to the backup mode have not been executed yet, the
standby system will retain the interrupt factors that the system has retained in the separate mode. Interrupt programs will not
be executed.
29.3

Precautions for Using the Annunciator (F)

This section describes the precautions for using the annunciator (F).
When the SET F instruction is used to register the annunciator
When the execution condition of the SET F instruction has been satisfied at system switching, the annunciator that is turned
on by the SET F instruction can be registered in the new control system. The SET F instruction registers the annunciator
at the rising edge of the execution condition. To register the annunciator in the new control system at system switching, add a
normally closed contact of SM1643 (ON for only one scan after system switching (standby system to control system)) as the
AND condition in the execution conditions of the SET F instruction.
Ex.
M0 (standby system)
Normally closed contact of SM1643
(standby system)
Execution condition (F10) of
the SET F instruction (standby system)
F10 (standby system)
(1) When M0 turns on in the control system before system switching, M0 of the standby system also turns on as a result of tracking transfer.
(2) The contact turns off for one scan after system switching.
(3) When the execution condition turns on, annunciator information is registered by the SET F instruction.
When the OUT F instruction is used to register the annunciator
When the execution condition of the OUT F instruction has been satisfied at system switching, annunciator information is
registered in the new control system at system switching.
Switching systems
(1)
ON
OFF
ON
OFF
ON
OFF
ON
OFF
(2)
(3)
29 PRECAUTIONS ON PROGRAMMING
29.3 Precautions for Using the Annunciator (F)
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