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Step Instructions Section 3-21
Example 2:
Branching Execution
The following process requires that a product is processed in one of two ways,
depending on its weight, before it is printed. The printing process is the same
regardless of which of the first processes is used. Various sensors are posi-
tioned to signal when processes are to start and end.
The following diagram demonstrates the flow of processing and the switches
that are used for execution control. Here, either process A or process B is
used depending on the status of SW A1 and SW B1.
0.01 (SW1)
0.02 (SW2)
0.03 (SW3)
W0.00
W0.00
W0.01
W0.01
W0.02
W0.02
0.04 (SW4)
W100.00
Process
A started.
Process
A reset.
Process
B started.
Process
B reset.
Process
C started.
Process
C reset.
Programming for process A
Programming for process B
Programming for process C
SW A1
SW A2
SW C1
SW C2
SW D
SW B2
SW B1
Process C
Process B
Process A
Guide
Weight scale
Conveyer B
Conveyer A
Printer
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