Programming of sequential control systems using functional block diagram language

摘要

The paper deals with the methodology of creation of sequential control system programs in the language of function block diagrams (FBD). After analyzing basic blocks of the sequential functions chart (SFC) language, the form of state block and implementation of branching or connecting paths of sequences are formulated using the FBD language. It is a simplification of the application of the SFC language. Our method of creating the sequential system ensures a compact form of the final program and is particularly useful for small PLC controllers. The method is illustrated by example of the simple sequential control system.