Named for its resemblance to a ladder, the diagram consists of two vertical rails connected by several horizontal rungs. Each rail is energized at a different voltage, and each rung contains at least ...

On the surface, a programmable logic controller (PLC) might seem like nothing more than a generic microcontroller, perhaps outfitted to operate in industrial settings with things like high temperat… ...

PLC operation is a function of these inputs and outputs. In the standard 3-wire control circuit, as shown in Fig. 1 on page 18, you'll notice a normally closed (N.C.) momentary stop push button, and a ...