PACs are programmable automation controllers. They are digital computers that hold and execute embedded programs. These are seen in many different types of electromechanical processes and usually control the machinery in factories.
This name is very similar to PLC (programmable logic controllers), which we are very accustomed to in automation. PACs are relatively new to the market and PLCs have been around since the 1960s. The arrival of these new controllers begs the question: “How are they different?”