3
SEQUENCE PROGRAM CONFIGURATION AND
EXECUTION CONDITIONS
3.3 Settings for Creation and Execution of Multiple Sequence Programs
3.3.6 Execution type setting and example of type changing
3 - 61
1
Overview
2
Performance
Specification
3
Sequence Program
Configuration and
Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files
Handled by CPU Module
6
Functions
7
Communication using
built-in Ethernet ports of
CPU module
8
Communication with
Intelligent Function
Module
(3) Example of instruction-triggered execution type changing
(a) Execution type changing instruction
Using this instruction can change the execution type even during sequence
program execution.
Use any of the PSCAN, PLOW
Note3.34
,PSTOP and/or POFF instructions to
change the execution type.Note32
Figure 3.55 Instruction-triggered execution type changing pattern
Note32
Table3.3 Instruction-triggered execution type changing timing
Execution type
before change
Execution instructions
PSCAN PSTOP POFF
PLOW
Note3.34
Scan execution type
Remains unchanged
from the scan execution
type.
Changes to the stand-
by type.
Turns OFF the output at
the next scan.
Changes to the stand-
by type at the next or
later scan.
Changes to the low
speed execution type.
Initial execution type
Changes to the scan
execution type.
Stand-by type
Remains unchanged
from the stand-by type.
No operation
Low speed execution
type
Note3.34
Suspends the
execution of the low
speed execution type
and changes to the
scan execution type at
the next scan.
(Executed at Step 0)
Suspends the
execution of the low
speed execution type
and changes to the
stand-by type at the
next or later scan.
Suspends the
execution of the low
speed execution type
and turns OFF the
output at the next scan.
Changes to the stand-
by type at the next or
later scan.
Remains unchanged
from the low speed
execution type.
Fixed scan execution
type
Changes to the scan
execution type.
Changes to the stand-
by type.
Turns OFF the output at
the next scan.
Changes to the stand-
by type at the next or
later scan.
Changes to the low
speed execution type.
Redundant
Universal
UD
Note3.34Note3.34
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
Since the Redundant CPU and Universal model QCPU cannot use low speed execution type
programs, it cannot change the execution type using the PLOW instruction.
Redundant
Universal
UD
Note3.34
Note3.34
Redundant
Note3.34
Universal
UD
Note3.34