Mitsubishi Electric MELSEC-Q Series User Manual page 102

7 FUNCTION
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(3) Clearing the Latch Range Device Data
The following table indicates the device status when latch clear is performed.
Latch Setting Made or Not
Device without latch range specified
Latch (1) setting (device set to "The clear is possible
with latch clear.")
Latch (2) setting (device set to "The clear is impossible
with latch clear.")
POINT
File registers (R) cannot be cleared with latch clear.
(See Section 10.7 for clearing file registers.)
(4) Precautions
The device details of the latch range are maintained with the battery (Q6BAT)
attached to the Basic model QCPU.
(a) The battery is needed to latch devices if sequence program are stored onto
the standard ROM to perform ROM operation.
(b) Note that if the battery connector is unplugged from the Basic model QCPU
connector during PLC power-off, the device contents in the latch range are
not maintained and will be indefinite values.
MELSEC-Q
Cleared or Maintained by Latch Clear
Cleared
Cleared
Maintained
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