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 ...

A family of programming languages for programmable logic controllers (PLCs). Of the three graphical and two textual languages, ladder logic (see example below) was the first language and widely used.

The fully integrated SMLC includes hardware and software building blocks that are engineered to easily plug together and work as a system. The programming platform — CoDeSys — is based on IEC 61131-3 ...