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MELSEC-Q
4 SEQUENCE PROGRAM CONFIGURATION AND EXECUTION
CONDITIONS
4.6 Data Clear Processing
(1) Data clear
The High Performance model QCPU clears all data except for the following,
when a reset operation is performed with RESET/L.CLR switch, or power ON to
OFF to ON.
(a) Program memory data (except for when "clear program memory" is set at
boot specification.)
(b) Data in the memory card
(c) Device data with latch specification (latch clear valid)
(d) Device data with latch specification (latch clear invalid)
(e) File register data
(f) Failure history data (when special register SD storage)
Data in (c) is cleared by operating "latch clear" with the RESET/L.CLR switch, or
operating "remote latch clear" from GX Developer.
See Section 7.6.4 for details on the remote latch clear.
(2) Device latch specification
(a) Specify the device latch (latch range setting) for each device at the "Device"
tab screen in the “(PLC) Parameter" dialog box.
There are two types of latch range settings:
1) Valid latch clear key
Sets the latch range that can be cleared by operating "latch clear" with
the RESET/L.CLR switch and remote latch clear.
2) Invalid latch clear key
Sets the latch range that can not be cleared even by operating "latch
clear" with the RESET/L.CLR switch or operating "remote latch clear"
from GX Developer.
(b) The devices in which RESET/L.CLR switch is set to invalid can only be
cleared by an instruction or GX Developer.
1) Instruction to clear method
Reset with the RST instruction or send "0" with the MOV/FMOV
instruction.
2) GX Developer clear method
Clear all device memory in the online PLC memory clear (including
latch).
Refer to the GX Developer operating manual for details of the GX
Developer operation methods.
POINT
To clear file registers or local devices, use the RST instruction to perform a reset
operation, or use the MOV/FMOV instruction to transmit "0".
REMARK
Refer to following manual for the MOV/FMOV instruction.
• QCPU (Q mode)/QnACPU Programming Manual (Common instructions)
Содержание QCPU (Q Mode)
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