![]() Whatever logic you use for the output, the opposite is required for the input.įor a sink logic, an NPN transistor provides a path to ground for the electrical load.Logic defines current flow in the circuit.Logic is defined by the type of components in the circuit.They differ by the type of component used and define the current flow. Sink and source logic circuits are commonly associated with PLC I/O signals, and they only apply to DC circuits. It can consist of any binary electric or electronic devices, including switches, relays, solid-state diodes, and transistors. It can include one or more binary inputs (on/off) and a single binary output. In this case, we're talking about an input circuit.Ī logic circuit is defined as an electric circuit (I/O) whose output is a function of the input. Examples of loads are light bulbs and motors. This is the opposite of a power source, such as a battery or generator, which produces power. In this case, I/O describes the signal communication between two devices (such as a PLC and a stepper driver) using on/off binary logic.Īn electrical load is an electrical component or portion of a circuit that consumes electric power. It could be a keyboard (input) and a monitor (output). I/O is defined as inputs/outputs, which in its simplest terms, is anything that executes an output based on an input. A DC power source flows from positive to negative. A digital electronic circuit uses DC voltage and discrete values (on/off). It requires a voltage and ground, where ground acts as earth to measure the potential voltage. These are connected by conductive wires or traces on a PCB. TerminologyĪn electronic circuit contains electronic components, such as resistors, transistors, capacitors, inductors and/or diodes. What does sink logic and source logic really mean? Let's start with some basic terminology. Most of the time, tech support engineers will direct you to a wiring diagram and advise you to follow it. How can you be sure that you're talking apples to apples? For example, is a sourcing logic the same as a PNP logic? "Are we sinking or taking a sinked source?" In our experience supporting motion control applications, we've heard it all. The difficulty starts when engineers or manufacturers use different wiring terminology. I still get that nervous feeling before I press the START button on a demo. If devices are not wired correctly, it can cause a range of issues from a motor simply not doing what's expected to irreversible product damage. For someone who has never had experience wiring I/O for motion control, it can be scary the first time. ![]()
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