Omron SYSMAC C Series User Manual page 44

Checking and running your program
Input/output monitor
In our sample program, the timer number is 00.
Now press
B
to move to the timer data display.
The timer currently is set for 3.0 seconds. To change this to 6.0 seconds,
press
CHG
and the PC display will query you about the new data.
0008DATA ? informs you that the operation to be performed is the setting
of a value for the instruction address 0008; TOO is the number of the timer;
#0030 is the timer's present set time; and #7??? asks what you want the
new set time to be.
In response, key in your new set time and write it to the PC memory.
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Follow the same procedure to change the set value of a counter.
While the PC automatically controls the equipment, you can keep a
watchful eye over the operation using the PC's monitoring capabilities.
You may, for instance, have a particular unit of equipment that you want to
check for correct operation. Or you may want to keep a running check on
the value of a down counter.
The C20 allows you to easily check the status of any device connected to
it by this procedure:
Place the PC in the MONITOR mode during operation.