Preliminary processing is a section at the beginning of the program that manages the operating modes:
With a blocking error:
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The chart is disabled.
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You can then drive the moving part in Manual mode, fix the error and acknowledge it from the panel.
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The chart is reinitialized when the error is fixed and acknowledged.
On switching to Manual mode:
Program in Ladder language
Initializing positions
Starting cycle
Confirming controller
Selecting automatic mode
Selecting manual mode
Disabling chart on error or when switching to manual mode
Reinitializing chart
Signaling errors
