Introduction
This book has been written as a user guide and tutorial for the new international standard IEC 1131-3 for programmable logic controllers (PLCs). If you are considering designing or writing control programs using any of the IEC 1131-3 languages for the first time, you are advised to gain an understanding of how programs are structured and can be built up from various software elements; this is reviewed in Chapter 2, 'IEC 1131-3 concepts'. This chapter will also explain how the standard provides a selection of programming languages for developing different parts of a control program. Later chapters give specific details on using each of the IEC 1131-3 languages. The suitability of each language for solving different types of industrial control problems is described along with techniques and examples. Facilities in the IEC 1131-3 and an accompanying standard IEC 1131-5 for communicating with other PLCs and devices are discussed in Chapter 12, 'Communications'.
Introduction, Page 1 of 2
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