Now that you've been introduced to the more common input and output devices that make up a ladder diagram, next time we'll explore in more depth how 2- and 3- wire control circuits tie the control ...

It examines the basic rules that are used to construct a ladder diagram program, including Boolean logic functions. It then illustrates these rules and how they relate to hard-wired circuitry by ...

As an example, the transistor-transistor logic (TTL) 7408 chip contains four, two-input AND gates in one integrated circuit (IC) package. These gates and other types on separate ICs can be wired ...