Discrete Output

Written by Jerry Ratzlaff. Posted in Instrumentation

A discrete output provides a discrete input to the PLC. An output relative to the device that reads either a TRUE or a FALSE, 1 or 0, or ON of OFF as an output signal. It would mean that the instrument to which it is attached receives an output from the PLC (or equivalent) that is either a TRUE or FALSE.

May be used to activate an alarm, beacon, valve or interlock device.

  • Abbreviated as DO