Ladder logic uses switch or relay contacts to implement Boolean expressions. In years past, ladder logic was made possible with discrete relays and was sometimes termed “relay logic.” Today most ...

In a PLC-controlled system, problems rarely occur inside the PLC. A malfunction is nearly always on the input side or output side of the PLC. The ladder diagram shows you what the inputs and outputs ...

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 ...