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3.2 Types of Output To a PLC



            Digital Output


                   Digital output (DO)are for the ON/OFFin your control scheme. Some


                   examples are motors that need just be ON or OFF, Lighting, solenoid

                   valves, door locks.



            Analog Output


                   Analog output (AO)are for variable level or range of output between OFF

                   or stopped and ON or full speed as for an electric motor for instance.


                   Examplesof analog outputs are a VFD (VariableFrequency Drive), a valve

                   position actuator, and an industrial variable power supply.







            3.2.1  Output device



                           •  Valves                            •  Stack lights


                           •  Actuator                          •  Control relays


                           •  Motor                             •  Pumps

                           •  Lamp                              •  Printers


                           •  Horns andalarms                   •  Fans















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