Ladder Diagram Example
AND Gate Example
The ANDF falling edge (one-shot) contact orientation performs a boolean AND operation based on the ON status of the assigned BOOL data register, S, for only 1 scan.
Ladder Diagram Example
When the falling edge (one-shot) contact, M17.8, is powered OFF AND the falling edge (one-shot) contact, M10.4, is powered OFF, the coil, D86.4, is deenergized.
When the falling edge (one-shot) contact, M17.8, is powered ON AND the falling edge (one-shot) contact, M10.4, is powered OFF, the coil, D86.4, is deenergized.
When the falling edge (one-shot) contact, M17.8, is powered ON AND the falling edge (one-shot) contact, M10.4, is powered ON, the coil, D86.4, is energized for only 1 scan.
The falling edge (one-shot) contacts, M17.8 and M10.4, will remain ON (unless otherwise specified), but the coil, D86.4, is deenergized after 1 scan.
Since scan programs execute in less than a second, it might not appear that the coil, D86.4, was energized.
Both, or one one-shot, contact(s) turn ON at the rising edge of an input signal or condition.