What is a Ladder Diagram? A Ladder Diagram is one of the simplest methods used to program a PLC. It
As we have seen with counter and timers, some PLC instructions generate digital values other than simple Boolean (on/off) signals.
The IEC 61131-3 standard specifies several dedicated ladder instructions for performing arithmetic calculations. Some of them are shown here: PLC
A counter is a PLC instruction that either increments (counts up) or decrements (counts down) an integer number value when