As implied in its name, preliminary processing is processing that is carried out first. A section is created at the beginning of the project to manage operating modes:
On a blocking fault:
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The chart is frozen,
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The moving part can then be controlled in manual mode, and the fault can be corrected and acknowledged from the front panel,
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The chart is reinitialized when the fault has been corrected and acknowledged.
When switching to manual mode:
Program in Ladder Language
Position initialization
Start cycle
Enable speed controller
Automatic mode selection (when there are 2 independent axes)
Automatic mode selection (when there are 2 interpolated axes)
Manual mode selection
Chart freezing on a fault or when switching to manual mode
Chart reset
Fault signalling
