Designing a Sequential Control System based on the Example of a Drill
S7-GRAPH for S7 300/400 Programming Sequential Control Systems
3-14 C79000-G7076-C526-01
When programming comparators, you can use the system information for steps as
the addresses. The addresses have the following significance:
•
Step_name.T: current or last activation time of the step
•
Step_name.U: current or last activation time of the step without the time of a
disturbance
3.9 Programming Monitoring Functions
To program monitoring functions:
1. Double-click step 2 to change from the “single page" display to the “single step"
display.
2.
Select the following button in the "LAD/FBD" toolbar
Insert comparator
3.
Position the comparator at the appropriate point on the supervision line and
enter the required monitoring time.
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