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Iec 61131 3 (english) Blogs & News

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9

IEC 61131-3: The ‘State’ Pattern

State machines are used regularly, especially in automation technology. The state pattern provides an object-oriented approach that offers important advantages especially for larger state machines. Most developers have already implemented state machines in IEC 61131-3: one consciously, the other one perhaps unconsciously. The following is a simple example of three ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
17.11.2018 | 35 0 | Stefan Henneken
7

IEC 61131-3: The generic data type T_Arg

In the article The wonders of ANY, Jakob Sagatowski shows how the data type ANY can be effectively used. In the example described, a function compares two variables to determine whether the data type, data length and content are exactly the same. Instead of implementing a separate function for each data type, the same requirements can be implemented much more elegantly with only ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
04.07.2018 | 105 0 | Stefan Henneken
7

IEC 61131-3: The ‘Observer’ Pattern

The Observer Pattern is suitable for applications that require one or more function blocks to be notified when the state of a particular function block changes. The assignment of the communication participants can be changed at runtime of the program. In almost every IEC 61131-3 program, function blocks exchange states with each other. In the simplest case, one input of one FB is ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
27.05.2018 | 127 0 | Stefan Henneken
10

IEC 61131-3: Unit-Tests

Unit tests are an essential tool for every programmer to ensure functioning of his software. Software bugs cost time and money, so you need an automated solution to find these bugs and preferably before the software is used. Unit tests should be used wherever software is professionally developed. This article is intended to provide a quick introduction and allow an ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
24.01.2018 | 278 0 | Stefan Henneken
9

IEC 61131-3: Extend UNION via inheritance

In the post IEC 61131-3: Additional language extensions, I briefly described the UNION. A reader comment has pointed out to me the possibility, that a UNION can also be expanded by EXTENDS. Since this simplifies the handling of a UNION and the norm does not indicate that, I would like to introduce this possibility in a (very) short post. As already described in a post, a UNION makes it ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
24.09.2017 | 236 0 | Stefan Henneken
7

IEC 61131-3: Parameter transfer via parameter list

Parameter lists are an interesting alternative for transferring parameters to PLC libraries. Strictly speaking, these are global constants (VAR_GLOBAL CONSTANT) whose initialization values can be edited in the Library Manager. When declaring arrays, their boundaries must be defined as constants. At the time of compilation, it must be known how large the array should be. ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
10.09.2017 | 256 2 | Stefan Henneken
3

IEC 61131-3: Additional language extensions

The focus of my post has been the object-oriented extensions so far. But there are several general, usually not so far-reaching innovations within TwinCAT 3. Below, they are briefly described. Array initialization If a declared array has to be initialized, the list with the initialization values should be set into square brackets. VAR aTest1 : ARRAY [1..5] OF INT : [1, 2, 3, 4, 5]; ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
17.06.2017 | 368 1 | Stefan Henneken
4

IEC 61131-3: Methods, Properties and Inheritance

Object-oriented programming (OOP) is a proven way of keeping the complexity of software systems in check. Until recently the preserve of languages such as C , Java and C#, IEC 61131-3 introduces the concept to PLC programming. Methods Previously, a function block consisted of internal, input and output variables. There was only one opportunity to modify internal variables ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
23.04.2017 | 744 0 | Stefan Henneken
11

IEC 61131-3 – The ‘Command’ Pattern

A command can be run on a function block by calling a method. Function block A calls a method of function block B. So far, so good, but how can such “commands” be exchanged flexibly between several function blocks. The command pattern provides an interesting approach. A small example from the home automation should help us at this. Suppose we have several FBs which represent each a ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
07.12.2016 | 560 0 | Stefan Henneken
6

IEC 61131-3: Namespaces

The third edition of IEC 61131-3 introduces the concept of namespaces. Namespaces group elements such as variables, function blocks, data types and libraries into coherent units. This means that elements are no longer identified solely using their names, but additionally using the associated namespace. I first started looking at this issue in late 2010 in CoDeSys V3. The ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
22.11.2016 | 562 0 | Stefan Henneken
10

IEC 61131-3: Arrays with variable length

While declaring arrays, one had always to define a constant value up to now. Since the 3rd edition of the IEC 61131-3, arrays can be declared with a variable length. Thus, you can create functions much more generically than previously. Although, variables can be used for array bounds, they have to be declared as constants. An adaption of the array bounds is thus not possible at ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
27.09.2016 | 610 0 | Stefan Henneken
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