XIO - Examine if Open

This channel, also called "examine off" or "normally closed" is an input or storage bit.

If the corresponding memory bit is a "1" (on), this instruction will not allow rung continuity and outputs on its rung will be de-energized.

Note:

Other factors may affect rung continuity.

If the corresponding memory bit is a "0" (off), this instruction will assume its normal status and allow rung continuity and outputs on the rung will be energized. Other factors can influence rung continuity.

If used as an input bit, its status should correspond to the status of real world input devices tied to the input image table by the identical addresses.