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CHAPTER2 SEQUENCE PROGRAMS
2
3
2.3 Settings When Progr
am is Divided
2.3.6 C
hanging the pr
ogram execution typ
e
2.3.6 Changing the program execution type
(1) Changing the execution type using instructions
(a) Instructions used to change the execution type
The execution type of sequence programs can be changed using instructions even during execution.
Use the PSCAN, PLOW,
, PSTOP, or POFF instruction to change the execution type.
Note6
Once the fixed scan execution type program is changed to another execution type, the type cannot be returned to the fixed
scan execution type.
Figure 2.42 Pattern of execution type change
Note6
Table2.3 Timing of execution type change
Execution type before
change
Instruction
PSCAN
PSTOP
POFF
PLOW
Scan execution type
Remains unchanged.
Changes to the stand-by
type.
Turns off outputs in the next
scan.
Changes to the stand-by type
in two scans later.
Changes to the low-speed
execution type.
Initial execution type
Changes to the scan execution
type.
Changes to the stand-by
type.
Turns off outputs in the next
scan.
Changes to the stand-by type
in two scans later.
Stand-by type
Changes to the scan execution
type.
Remains unchanged.
No processing
Low-speed execution type
Stops execution of the low-
speed execution type program
and changes to the scan
execution type in the next scan.
(Executed from the step 0.)
Stops execution of the low-
speed execution type
program and changes to the
stand-by type.
Stops execution of the low-
speed execution type
program and turns off outputs
in the next scan.
Changes to the stand-by type
in two scans later.
Remains unchanged.
Fixed scan execution type
Changes to the scan execution
type.
Changes to the stand-by
type.
Turns off outputs in the next
scan.
Changes to the stand-by type
in two scans later.
Changes to the low-speed
execution type.
Initial execution
type program
Stand-by type
program
Low-speed execution
type program
Scan execution
type program
Fixed scan execution
type program
PSCAN
instruction
PSTOP,
POFF instruction
PSTOP,
POFF instruction
PSTOP,
POFF instruction
PLOW
instruction
PSTOP,
POFF
instruction
PSCAN
instruction
PSCAN
instruction
PLOW
instruction
PLOW
instruction
PLOW
instruction
PSCAN
instruction
Note2.6
The Redundant CPU does not support the use of low-speed execution type programs.
Redundant
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