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Ethernet for Control Automation Technology
Published in Richard Zurawski, Industrial Communication Technology Handbook, 2017
Gianluca Cena, Stefano Scanzio, Adriano Valenzano, Claudio Zunino
Two textual and three graphical languages are included in the IEC 61131-3 standard: Instruction list (IL) is a low-level programming language, with a level of abstraction similar to assembler.Structured text (ST) resembles high-level programming languages like C or C++.Ladder diagram (LD) allows to represent the program as a sequence of digital circuits, including contacts, coils, and specific blocks like counters, timers, etc.Function block diagram (FBD) is based on block diagrams, where blocks are connected through oriented arcs. It describes how inputs, through the blocks, are transformed into outputs.Sequential function chart (SFC) represents the control program as a sequence of states (steps) with associated actions activated by given conditions (transitions).
Instruments for Data Acquisition
Published in Felix Alberto Farret, Marcelo Godoy Simões, Danilo Iglesias Brandão, Electronic Instrumentation for Distributed Generation and Power Processes, 2017
Felix Alberto Farret, Marcelo Godoy Simões, Danilo Iglesias Brandão
The structured text is a high-level textual programming language, which remembers Pascal, BASIC, and C languages. This programming language is based on the Boolean logic, IF, WHILE, and case selector instructions. The instruction list is a sequential textual language based on patronized commands, like Assembler language. The main disadvantage of textual languages is that they are more complex than graphical languages, and verification of the code is harder, hindering in finding the possible code errors.
Programmable Controllers
Published in William S. Levine, The Control Handbook: Control System Fundamentals, 2017
A small number of basic machine instructions can solve most sequencing problems. A program that contains these instructions is called instruction list (IL). Some of the fundamental machine instructions are listed here; usually they can operate on bits as well as on bytes:
Automation and control of the thermal mixing process
Published in Systems Science & Control Engineering, 2023
L.C. Parra-Camacho, A.F. Rodriguez-Bayona, J.J. Carreno-Zagarra
The Function Block Diagram (FBD) programming language described in Commission (2003) is a restricted graphical representation of the machine-orientated language Instruction list (IL) with common logical block operators (AND, OR, NOT…). Ausberger et al. (2020) and Pavlovic and Ehrich (2010) It was used for programming HC900 Honeywell DCS through Designer Software, adapting the logic made in Grafcet and dividing the FBD into different sections (Inputs, outputs, A1, F1, F2…), making its read easier.