Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 44)

Fundamental Instruction Set

Chapter 5

57

The rung below uses parallel logic:

False

True

Here two conditions are parallel. As long as one of the conditions (C1 or C2) is

true, a continuous path to the action exists. Therefore, the action is performed.

False

True

Figure 5.2 shows a program rung with branching, as it would appear by the

1770-T3 terminal display. You create a branch by using two different branch

instructions. These are the branch start and branch end instructions.

Nested Branching

The rung below shows a nested branch.

110

010

110

Creating nested branches is not possible because the branch end instruction

completes a branch group. But the above rung shows a single branch group

with two branch end instructions. Above, the examine-on instruction with the

address 11011 is actually a branch group within a branch group.

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 44