3
-
8
(2) Latch specification of devices
Set a latch range for each latch-target device in the Device tab of the PLC parameter dialog box. (
(a) Latch range setting
Two kinds of latch range can be set by GX Developer.
1) Latch clear operation enable range ("Latch (1) start/end")
Data in this latch range can be cleared by the RESET/L.CLR switch
or the remote latch clear
operation.
Note2
2) Latch clear operation disable range ("Latch (2) start/end")
Data in this latch range cannot be cleared by the RESET/L.CLR switch
operation.
(b) Clearing device data set in the latch clear operation enable range
Clear data by the RESET/L.CLR switch
or the remote latch clear operation (
(c) Clearing device data set in latch clear operation disable range
Clear data by:
• resetting devices with the RST instruction,
• transferring K0 with the MOV or FMOV instruction, or
MELSEC-Q/L Programming Manual (Common Instruction)
• executing "Clear device's whole memory (including latch)" from the screen opened by selecting [Online]
[Clear PLC memory] in GX Developer.
If the start mode is set to the hot-start mode in the Redundant CPU, device data outside the latch range are held as well.
(Except some devices, such as the step relay and the index register.)
Remark
For the operation of GX Developer, refer to the following.
GX Developer Version 8 Operating Manual
Note2
Note3.2
The Basic model QCPU does not support the latch clear operation by the switch.
Basic
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