7.1 User Program Types and Execution Timing
7.1.1 Ladder Programs
7
Cr
eating U
s
er Pr
ogram
s
7-7
Scheduling the Execution of High-speed and Low-speed Scan Process
Drawings
High-speed scan process drawings (DWG.H) and low-speed scan process drawings (DWG.L)
cannot be executed at the same time. DWG.L drawings are executed during the idle time of
DWG.H drawings.
The period during which DWG.H drawings are executed is called the high-speed scan time.
The period during which DWG.L drawings are executed is called the low-speed scan time.
*
Background processing is used to execute internal system processing, such as communications processing.
Setting the High-speed and Low-speed Scan Times
Use MPE720 and perform the procedure given below to set the high-speed and low-speed
scan times.
1.
Stop the CPU.
2.
Select
File
−
Environment Setting
from the menu bar. Alternatively, click the
System
Setting
Button on the My Tool View of the Start Tab Page.
The Environment Setting Dialog Box will be displayed.
3.
Select
Setup
−
Scan Time Setting
.
The following dialog box will be displayed.
Setting Value:
Enter the scan time settings.
Current Value:
A value of 0.0 ms is displayed when the MPE720 is offline. Otherwise, the actual
processing times for the scans are displayed.
DWG.L
(Low-
S
peed
S
can Proce
ss
Drawing)
DWG.H
(High-
S
peed
S
can Proce
ss
Drawing
s
)
Low-
s
peed
s
can time
High-
s
peed
s
can
time
High-
s
peed
s
can
time
High-
s
peed
s
can
time
High-
s
peed
s
can
time
Background*
: Actual proce
ss
ing time during the
s
can
