Power Rails

Vertical power rails are used in FFLD language for designing the limits of a rung.

The power rail on the left represents the TRUE value and initiates the rung state.

Power rails can also be used in FBD"Function block diagram" A function block diagram describes a function between input variables and output variables. A function is described as a set of elementary blocks language. Only Boolean objects can be connected to power rails.

See also

FFLD Contacts   FFLD Coils