3 Wire Sensor Connection To Plc

The difference is that the 3 wire device has a supply source supply common and signal output.

3 wire sensor connection to plc.

Three wire sensor in plc three wire sensor connection in plc. Wire 3 black wire is always connected to the load which is the terminal for an input on a plc digital input card. This is the negative terminal that is present on the power supply. Here s a simple way remember how to wire up a 3 wire dc pnp or npn sensor.

In this simplified diagram of an inductive switch there are three wires. Pnp switched positive npn switched negative switched refers to which side of the controlled load relay small indicator plc input is being switched electrically. Sourcing plc input module three wire devices work in the same manner. Sensors with 3 and 4 wires have dedicated output wires.

In the diagrams below for a pnp sourcing field device the supply common is connected to the field device common. 4 20 ma transmitter wiring types. Normally open or normally closed sensor logic does not affect physical connections between a sensor and a plc. To review we have learned that there are many types of discrete 2 wire dc sensors that can be wired to a plc input.

Knowing how to connect a 3 wire dc solid state proximity sensor to a plc programmable logic controller is dependent on the type of proximity sensor and the plc to be used that is specific to the design of the circuit and the preferred application. We will break it down and go over the wiring to a plc input. There are two basic types of 3 wire proximity sensor applicable to certain types of plc. Additional component connections to plc include the following.

2 wire 3 wire 4 wire transmitters are available with a wide variety of signal outputs. If we connect the photoelectric switch to plc input channel 3 the red wire will be connected to 24vdc and the black wire will be connected to terminal d. The brown wire is the vdc wire that connects to the positive side of the power supply and the blue wire is connected to the common terminal of the power supply. Note the each of these sensors has three wires.

A 3 wire sensor typically is color coded with one brown wire one blue wire and one black wire. One brown wire one blue wire and one black wire.