Direction of Flow in Networks

A network is defined as a maximal set of interconnected graphic elements. A network label delimited on the right by a colon (:) can be associated with each network or group of networks. The scope of a network and its label is local to the program organization unit (POU) where the network is located.Graphic languages are used to represent the flow of a conceptual quantity through one or more networks representing a control plan. Namely, in the case of function block diagrams (FBD), the “Signal flow” is typically used, analogous to the flow of signals between elements of a signal processing system. Signal flow in the FBD language is from the output (right-hand) side of a function or function block to the input (left-hand) side of the function or function block(s) so connected.