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