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MELSEC-Q
7 FUNCTION
(3) Clearing the Latch Range Device Data
The status of devices to which "latch clear" is made is shown in the table below.
Latch setting
Clear/retention after "latch clear"
Devices not designated in latch range
Clear
Latch (1) setting (Devices with "latch clear" option)
Clear
Latch (2) setting (Devices without "latch clear" option)
Retain
: Refer to Section 4.6 for the clearing method.
POINT
File registers (R) cannot be cleared with latch clear.
(See Section 10.7 for clearing file registers.)
(4) Precautions
(a) Even if the device has been latch-specified, it will not be latched the when
the local device or the device initialization is specified.
(b) The device details of the latch range are maintained with the battery
(Q6BAT) attached to the High Performance model QCPU.
1) The battery is necessary to latch the device if ROM operation is
performed using the sequence program that has been stored on the
standard ROM or memory card.
2) Take care that, if the battery connector is disconnected from the
connector of the High Performance model QCPU when the High
Performance model QCPU is turned off, the latch range device
memory is not retained but becomes undefined.
Содержание QCPU (Q Mode)
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