You have the option of changing the called block for a block call. But keep in mind that no new instance data blocks are created, for example, when changing from a function (FC) to a function block (FB).
Procedure
To change the called block of a block call, follow these steps:
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Click on the name of the called block within the block call and press the <F2> key. Or double-click the name of the called block.
A text box opens, and the name of the currently called block is selected.
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Enter the name of the block you want to call or select a block in the autocompletion.
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If you want to call an FB, create a new instance data block, if necessary, and specify it as operand.