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318 Using an Add-On Instruction Function Block Diagram Nub Item Description Nub on the end of pin. This is a required Parameter. Enter a tag. You must wire the pin to an IREF, OREF, connector, or another block to verify. Single Question Mark. This is a required Parameter. Enter a tag. No Nub on the end of pin. This is not a required Parameter. You can either: • leave as is and use the default value. • if it’s an input value, enter a different value. Structured Text The instruction expects arguments for required Parameters as listed in the instruction tooltip. TIP Publication 1756-PM001I-EN-P - January 2007 For help with an instruction, select the instruction and then press [F1]. In Structured Text, make sure the cursor is in the blue instruction name.
