Automation Direct DirectLogic Series 애플리케이션 노트 - 페이지 2

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Figure 1

Flowchart example using standard RLL programming

Figure 2

Flowchart example using stage programming

Stages are not like subroutines. They are scanned just as if they are regular ladder logic. The closest

thing to a stage is a Master Control Relay. If the MCR is on, then the power rail is processed. If the MCR

is off, then the power rail is skipped. Stages operate in much the same fashion. If the stage is enabled,

the power rail has power and the logic is executed. If it is disabled, then all logic within that stage is

skipped (not processed) because the power rail has no power.

There are three main behaviors to Stage programming:

1) When the stage bit is on, the

corresponding stage is scanned and logic within that stage is evaluated and processed.

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