In this lesson we'll examine virtual relays, software generated holding instructions, and the set and reset functions offered by most PLC programs. We'll learned that virtual relays mimic the behavior of traditional hardwired relays in that their associated instructions respond to the logical state of the virtual coil that can be energized or deenergized by the logic in a particular rung. We'll learn that virtual relays can extend the permissible number of contacts in a rung and be used to facilitate holding circuits, among other functions. We'll additionally examine software generated holding instructions that mimic the function of auxiliary contacts in that they respond to the logical state of a particular output that can be energized or deenergized by the logic in a particular rung. Finally, we'll examine the set and reset functions that selectively energize or deenergize an output and maintain this last asserted state until instructed otherwise. (Full Lecture)
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