State Function Chart to Ladder Diagram Translation

Abstract:

State Function Chart to Ladder Diagram Translation

 This whitepaper describes a procedure for translating state function charts, which are great for sequential control design, into ladder diagrams, which are supported on almost all programmable logic controllers (PLC).  Two approaches to the translation are considered; one using ladder diagram primitives and the other using higher level functions.  Then, a simple example and real application, in which the translation technique was used, are presented.

When the ladder diagram is the only language available, this translation technique has been invaluable in structuring, implementing, debugging, and maintaining PLC programs for complex machinery.

Posted in: PLC