PLC Inputs and Output

PLC Input

The input interface is the circuitry , which connect the PlC input terminal to the Processor .

Typically input signal to the PLC are provided from:

1.Sensor

2. Push Button

3.Toggle Switch

Sensors:-

These are used to detect the presence of a component.

Push Button

These are used to start or stop a process.

Toggle Switches

These are used to give a constant high or low output. These Switches may also provide inputs to PLC . All of these inputs however are either present or not present. The PLC only connected with ON or OFF signal at its input. 

The interface is used to convert input signal AC to DC from these input device to low level DC voltage signal that is used in the Processor.The interface may also have to provide electrical isolation to prevent noise and the voltage spikes on the input lines from distorting the input signal .

PLC Output

The output Interface is an electronic circuitry , which connect the processor to the PLC output terminal. These output terminal are connected to the plant to control the different output like Indicator, Motor Starter, Valves and Hooters.

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Indicator:-

These are used to indicate the start or stop of a process .

Motor Starter:-

It is used to change the state of a motor from ON or OFF .

Valves:-

These used to change the state of valve from ON or OFF .

Hooters :- 

These are used to indicate the alarm occurred during the process.

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