4 - 14 4 - 14
MELSEC-Q
4 SEQUENCE PROGRAM CONFIGURATION AND EXECUTION
CONDITIONS
(3) Changing the Execute Type
(a) The Execute Type setting made at the "Program" tab screen in the “(PLC)
Parameter" dialog box can be changed at any time while a sequence
program is executed. To change the execute type of a program, use a
PSCAN, PLOW, PSTOP or POFF instruction.
Initial execution
type program
Scan execution
type program
Low speed execution
type program
Stand-by type
program
Fixed scan execution
type program
PSCAN
PSCAN
PLOW
PLOW
PSTOP
POFF
PSTOP
POFF
PSCAN
PSTOP
POFF
PSTOP
POFF
1
PLOW
PSCAN
(b) The following table shows the timing of changing the execute type of a
program by using a PSCAN, PLOW, PSTOP or POFF instruction.
Executed instruction
Execute type before change
PSCAN
PSTOP
POFF
PLOW
Scan execution type
No change - remains
scan execution type.
Initial execution type
Becomes stand-by
type.
Output is turned OFF
in the next scan.
Becomes stand-by
type from the next
scan after that.
Stand-by type
Becomes scan
execution type.
No change - remains
stand-by type.
No processing.
Becomes low speed
type.
Low speed execution type
Low speed execution
type execution is
stopped: becomes
scan executions from
the next scan.
(Execution from step
0.)
Low speed execution
type execution is
stopped: becomes
stand-by type from the
next scan.
Low speed execution
type execution is
stopped, and output is
turned OFF in the
next scan. Becomes
stand-by type from the
next scan after that.
No change - remains
low speed
executions.
Fixed scan execution type
Becomes scan
execution type.
Becomes stand-by
type.
Output is turned OFF
in the next scan.
Becomes stand-by
type from the next
scan after that.
Becomes low speed
type.
POINT
1: If the fixed scan execution type program is changed to another execution type,
you cannot return to the fixed scan execution type.
Содержание QCPU (Q Mode)
Страница 111: ...5 19 5 19 MELSEC Q 5 ASSIGNMENT OF I O NUMBERS MEMO ...
Страница 450: ...App 59 App 59 MELSEC Q APPENDICES MEMO ...