Discrete output modules read the desired output state from the PLC output scan and converts that logical status (off/on) into the correct real world electrical signal. The field devices that a PLC output module will need to control may differ in their voltage requirements. There are several standard voltages and types of output signals.

Output Devices

  • Alarms
  • Lights
  • Relays
  • Fans
  • Solenoids
  • Valves

Standard Output Ratings

  • 12 to 48 volts AC/DC
  • 120 volts AC/DC
  • 230 volts AC/DC
  • Dry contact (relay)
  • TTL
  • 5 to 50 volts DC