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S7 - Toggle function with Set/Reset override.

contributed by: Helge Slettvoll

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Abstract

Function Block with three input bits: Toggle, Set and Reset. Status output bit changes accordingly - from 0 to 1 or from 1 to 0 on rising edge of Toggle input.

Set and Reset input overrides Toggle input. If Set and Reset are both 1, then Status is 0 (Reset dominant).

Helper bits are kept in instance data blocks, thus reducing the risk of typical copy/paste errors and simplifying memory allocation.

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