Omron CX-PROGRAMMER V9 - Page 185

PART 1: CX-Programmer
CHAPTER 4 – Reference OMRON
CX-Programmer _Page 102
The minimum cycle time and the Change Button are displayed only for CJ2H CPU Units with unit version 1.1
or later or CJ2M CPU Units.
For certain CV-series PLCs if the ladder program contains Mark instructions, the PLC Cycle Time dialog
permits the measurement between the Start Mark and Stop Mark instructions.
Use the following procedure to measure PLC cycle time.
1, 2, 3…
1. Select the PLC object in the project workspace.
2. Select the Work On-line button from the toolbar. A confirmation message is displayed;
select the Yes pushbutton to connect to the PLC.
3. Open the cycle time dialog using the Cycle Time command in the PLC/Edit menu.
The mean, minimum and maximum cycle time is shown in the Cycle Time fields.
Select the Reset button to empty the PLC’s history buffer for these fields – the values
will then be calculated and updated by the PLC using the latest values only.
4. To measure the time to execute between two points in a program, enter the Start mark
and stop mark numbers in the Start Mark # field and Stop Mark # field. Note that only
certain PLCs have this feature. Also, MARK instructions must have been placed in the
program/s and downloaded to the PLC. Select the Measure pushbutton – a measurement
will then be taken and displayed in the Time field. Select the Abort pushbutton to cancel
the measurement.
5. Select the Close pushbutton to complete the operation.
Changing the Minimum Cycle Time Online
With CJ2H CPU Units with unit version 1.1 or later or CJ2M CPU Units, the minimum cycle time can be
changed to a specified value even during PLC operation in MONITOR Mode when the cycle time is set to
“constant” in the cycle time settings in the Timings/Synchronous Tab Page in the PLC Setup.
1, 2, 3…
1. Click the Change Button in the PLC Cycle Time Dialog Box. The Constant Cycle Time
Setting Dialog Box will be displayed so that you can set a minimum cycle time.
2. Change the minimum cycle time (ms).
3. Click the OK Button. The Constant Cycle Time Setting Dialog Box will be closed and
the minimum cycle time will be updated.