Function Block (AOI)

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Description

Ladder Diagram function block is a standalone organisational unit. This block is used in the absence of general hierarchy of controller, task, program and Ladder Diagram. It is also called as an AOI block. The Ladder Diagram function block consists of Ladder Diagram and function block variables. The function block variables represents the function variables used in the Ladder Diagram and provides information about its data types, size and initial value.