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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.
High- peed can
time
DWG.H
(High- peed
can Proce
Drawing )
DWG.L
(Low- peed
can Proce
Drawing)
Background*
*
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.
Low- peed can time
High- peed can
High- peed can
time
time
: Actual proce ing time during the can
7.1 User Program Types and Execution Timing
7.1.1 Ladder Programs
High- peed can
time
7
7-7
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Troubleshooting
