Relay Ladder Logic

Relay Ladder Logic is a flow chart scheme where relays and contacts are used to indicate order of operations and processes to be performed. The "ladder" is read left to right from top to bottom. As a word of warning, many computer programs have problems with this data format, and will try to preform all rungs simultaneously.

Though this method tells the designer what operations are to be performed, it doesn't tell him how to wire it.

See Ladder logic for more information.