UnityLL984 blocks have a restricted layout. In Ladder Logic of Control Expert LL984 - they can occupy vertically one to three cells. Horizontally they cover one cell. As for contacts, each cell can have an input and an output of the BOOL data type. In addition to contacts, each cell of a block can contain a numerical constant or a reference to BOOL or word parameters - the nodes.
Node will be used in LL984 Editor in Control Expert to describe input and output parameters placed inside a cell of a block.
Control Expert function blocks provide input and output parameters.
For compatibility reason in the LL984 Editor of Control Expert the node parameters will be displayed inside the block.
The node parameters are input, output or input/output parameters depending on their functionality.
According to their positions, nodes are determined with the names:
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Top node
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Middle node
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Bottom node
Inputs and outputs to block cells are equivalently named:
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Top input pin and Top output pin
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Middle input pin and Middle output pin
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Bottom input pin and Bottom output pin
According to their functionality, nodes, inputs and outputs can be used or unused.
Example AND
