Block diagram  From Wikipedia, the free encyclopedia Jump to:
navigation, search    The block diagram is typically used for a
higher level, less detailed description aimed more at
understanding the overall concepts and less at understanding the
details of implementation. Contrast this with the schematic
diagram and layout diagram used in the electrical engineering
world, where the schematic diagram shows the details of each
electrical component and the layout diagram shows the details of
physical construction.  Because block diagrams are a visual
language for describing actions in a complex system, it is
possible to formalize them into a specialized programmable logic
controller (PLC) programming language. An example is the
Function block diagram, one of five programming languages
defined in part 3 of the IEC 61131 (see IEC 61131-3) standard.
Since this is a real, bona fide computer programming language,
it is highly formalized (see formal system) with strict rules
for how diagrams are to be built. Directed