Structured programming based on IEC SC 65A; using alternate programming methodologies and languages with programmable controllers

Abstract

The author discusses the benefits of using structured programming, sequential function charts, and structured text as an alternative or supplement to the ladder logic traditionally used for programming of programmable controllers with regard to the pending IEC SC65A/B standard (soon to become IEC 1131). The aim is to identify the programmable controller applications where the methodologies can be applied and consider effective strategies for applying programmable controllers.<>