The terms programmable logic controller (PLC) and programmable automation controller (PAC) are often interchanged with one another. Some argue they are one in the same so it does not matter what terminology is used as long as the one you are referring to is the correct choice for your automation control requirements. However, when it comes to training for PACs, it is critical for a user to know the difference between a PAC and PLC. In this article, Industrial Business Network defines the PAC in relationship to the PLC and differences from a training perspective.