PLCとは Power Line Communication の略で、電力を通信回線としても利用する技術です。端的に言えばコンセントに差して使うネットワークで、かつて流行りそうだったものの諸般の事情により普及しなかった通信方式です。しかし今日はこのPLCの話ではありません。

When learning ladder logic, I was told that some new PLC systems were moving to scripted programming languages. My instructor assured us that we would not need to know anything other than ladder logic ...

There are various approaches to developing programmable logic controller (PLC) applications using experimental techniques. Modifying existing PLC ladder logic programs is another common approach ...