Omron HOME SECURITY SYSTEM - MOTION SENSOR FQM1-MMA21 - Manual (Page 22)

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Data Backup 5
mentary power interruptions. For operating parameters and other long-
term data, use the portion of DM Area stored in flash memory in the Coor-
dinator Module and transfer it to the Motion Control Modules before start-
ing operation.
The data in the DM Area and error log will become unstable or corrupted if the
power to the system is OFF for longer than the backup time.
If the power supply is to be turned OFF for an extended period of time, use
D30000 to D32767 in the Coordinator Module, which is backed up in flash
memory, to store data.
Otherwise, the Memory Not Held Flag (A404.14) can be used as the input
condition for programming using data in areas stored for power interruptions
to perform suitable processing.
A404.14: Turns ON when power is turned ON if data stored for power inter-
ruptions in the DM Area or error log is corrupted.
DM Area words D30000 to D32767 in the Coordinator Module are backed up
in flash memory as described in the next section.
Backing Up DM Area Data in Flash Memory
DM Area words D30000 to D32767 in the Coordinator Module is read from
flash memory when the power supply is turned ON. We recommend using DM
Area words D30000 to D32767 in the Coordinator Module to store operating
parameters and other data required for system operation and then using the
DM transfer function to transfer the data from the Coordinator Module to the
Motion Control Modules at the start of operation.
A404.14
Processing for
corruption of data
backed up for
power interruptions