When a PLC is used primarily to replace relays, timers, and counters, it's hard to beat the simplicity and usefulness of ladder diagram programming. Their ability to accept programming in ladder ...

PLC operation is a function of these inputs and outputs. In the standard 3-wire control circuit, as shown in Fig. 1 on page 18, you'll notice a normally closed (N.C.) momentary stop push button, and a ...

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 ...