Sensors are devices that convert a physical condition into an
electrical signal for use by a controller, such as a PLC. Sensors
are connected to the input of a PLC. A pushbutton is one
example of a sensor that is often connected to a PLC input. An
electrical signal indicating the condition (open or closed) of the
pushbutton contacts is sent from the pushbutton to the PLC.
electrical signal for use by a controller, such as a PLC. Sensors
are connected to the input of a PLC. A pushbutton is one
example of a sensor that is often connected to a PLC input. An
electrical signal indicating the condition (open or closed) of the
pushbutton contacts is sent from the pushbutton to the PLC.
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