How to Wire Discrete DC Sensors to PLC - Part 2

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How to Wire Discrete DC Sensors to PLC - Part 1:
realpars.com/discrete-sensors-part-1/


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In this video, you will learn how to wire a 3-wire DC sensor, like an inductive proximity sensor, to a PLC input card.

You will also learn what a 3-Wire Discrete sensor is and recognize some of the common types of 3-Wire Discrete sensors.

DC sensors can be used to indicate the state of a device or a process to the PLC program.

Knowing these input states can allow the PLC program to make decisions, such as, when to start or stop a conveyor motor.

There are many types of discrete 3-wire DC sensors that can be wired to a PLC input.

Some 3-wire devices are NPN or “sinking” sensors, and some are PNP, or “sourcing” sensors. The difference is in how the device operates when the switch actuates.

NPN switches “sink” DC common to the black wire when the switch is activated.

PNP switches “source” 24 Volts DC to the black wire when the switch is activated.

Remember, in both cases, the black wire is connected to the PLC input channel terminal.

For most 3-wire devices, there is typically one brown wire, one blue wire, and one black wire.

A schematic of your specific DC digital PLC input card is required to determine how your specific device should be wired.

For a 3-wire PNP discrete input device, the brown wire will be connected to +24 Volts DC, the blue wire will be connected to DC common, and the black wire will be connected to the PLC digital input channel terminal.



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