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Methods Blogs & News

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7

IEC 61131-3: The generic data type T_Arg

... a separate function for each data type, the same requirements can be implemented much more elegantly with only one function using data type ANY. Some time ago, I had a similar task. A method s hould be developed that accepts any number of parameters. Both the data type and the number of parameters were random. During my first attempt to find solution, I tried to use a variable-length ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
04.07.2018 | 74 0 | Stefan Henneken
7

IEC 61131-3: The ‘Observer’ Pattern

... a list of observers. Using the methods Attach() and Detach(), the individual Observers ... observer list in an array. The methods for logging on and off the ... subject. The management code for the methods Attach() and Detach() could be moved ... LREAL; fbSubjectBase : FB_SubjectBase; END_VAR The methods Attach() and Detach() can then access ... of observers), the push method s hould be used.
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
27.05.2018 | 89 0 | Stefan Henneken
10

IEC 61131-3: Unit-Tests

... library that provides methods for verifying variables (assert methods ). If a ... window. The assert methods are contained in ... of the assert methods always begin with ... for validity. Some methods contain additional parameters. ... have corresponding assert methods . Some special ... using the assert methods . The execution ... cases that test methods of FB_Foo are ... methods validate the overall ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
24.01.2018 | 225 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 | 193 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 | 210 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 | 310 1 | Stefan Henneken
4

IEC 61131-3: Methods, Properties and Inheritance

... to PLC programming. Methods Previously, a function ... define additional sub-functions (methods ) within a ... by the user. Methods are comparable to ... Just like functions, methods can also contain local variables. Using methods , the above ... Start() and Stop() methods can access internal ... modified by other methods within the function ... Methods can also include ... and methods with no return ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
23.04.2017 | 673 0 | Stefan Henneken
11

IEC 61131-3 – The ‘Command’ Pattern

... necessary sequence of methods calls has to ... FB knows, which methods have to be ... buttons using the method S etCommand(). Thus, FB_SwitchPanel ... of the corresponding methods or inputs. Application ... buttons with the method S etCommand(). The method ... designed generically. The method S etCommand() provides possibility ... required methods of the receiver. ... method S etCommand() of the ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
07.12.2016 | 497 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 | 481 0 | Stefan Henneken
10

IEC 61131-3: Arrays with variable length

... and lower array bounds can be queried in the function. Currently, arrays with a variable length can be passed only to VAR_IN_OUT variables of functions, function blocks and methods . (One would hope that VAR_INPUT and VAR_OUTPUT variables will be supported in the future.) Here is an adjusted example: FUNCTION F_CalcSum1DimArray : LREAL VAR_IN_OUT arrData : ARRAY[*] OF LREAL; ...
codesys-v3 iec-61131-3 iec-61131-3-(english) inheritance interfaces methods oop plc twincat
27.09.2016 | 540 0 | Stefan Henneken
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