Mission Critical Program Design and Authoring.
Introduction
Programmable Logic Controllers (PLCs) are the major components in industrial automation and control systems. The controlling nature of PLC is ranging from simple- push button switching to a single motor to several complex control structures. The PLC programming is an important task of designing and implementing control application depending on customers need. A PLC program consists of a set of instructions either in textual or graphical form, which represents the logic to be implemented for specific industrial realtime applications.
IEC 61131-3
IEC 61131-3 is the international standard for programmable controller programming languages. As such, it specifies the syntax, semantics and display for the following suite of PLC programming languages:
- Ladder diagram (LD)
- Sequential Function Charts (SFC)
- Function Block Diagram (FBD)
- Structured Text (ST)
- Instruction List (IL)