86
3 DEVICES
3.8 Latch Function
3.8 Latch Function
The content of each Motion CPU device is cleared in the following cases, and is returned to the respective default value (bit
devices: OFF, word devices: 0).
• Multiple CPU system power supply OFF to ON
• Multiple CPU system reset
• Power failure longer than permissible momentary power failure time
The content of each device for which the latch setting has been specified is retained in the event of a power failure even in the
above cases. Consequently, when managing data when performing consecutive control, all data is retained, allowing control
to be continued even if the Multiple CPU system power supply turns OFF to ON, or if a power failure longer than permissible
momentary power failure time occurs.
Devices for which latch is possible
Devices for which a latch is possible are as follows.
• Internal relays (M)
• Link relays (B)
• Annunciators (F)
• Data registers (D)
• Link registers (W)
• Motion registers (#)
Operation when latches used
Operation in the program is the same regardless of whether a latch has been set.
Latch range setting
Set the latch range for each device with the device points/latch setting.
Multiple latch ranges can be set for each device type. A combined total of 32 latch ranges can be set for latch (1) and latch (2).
However, the latch range must be set so that the latch (1) and latch (2) ranges do not overlap.
Latch range setting is valid when the Multiple CPU system power supply is turned ON.
[R Series Common Parameter] [Motion CPU Module] [CPU Parameter] "Device Related Setting" "Device
Points/Latch Setting" "Detailed Setting"
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