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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.