Timing instructions are usually connected like relay coil instructions in the ladder diagram, so any combination of input conditions can be programmed to trigger them. When a timing instruction is ...

Ladder logic is the basis of most control functions Ladder logic uses switch or relay contacts to implement Boolean expressions. In years past, ladder logic was made possible with discrete relays and ...

This class explains how basic ladder diagram programming is used to program PLCs. It examines the basic rules that are used to construct a ladder diagram program, including Boolean logic functions. It ...