IEC is an IEC standard for programmable controllers. It was known as IEC before the change in numbering system by IEC. The parts of the IEC. IEC Edition INTERNATIONAL. STANDARD. NORME. INTERNATIONALE. Programmable controllers –. Part 6: Functional safety. View Abstract. Product Details. Detail Summary. View all details. Active, Most Current. RU. Additional Comments: RUSSIAN * SAME AS IEC Format.
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Instance of the function block are created at run-time as well. In this case, a function 611331-6 is defined the actual class factorywhich provides a reference to another function block through a method.
HW design and development.
Notify me of new posts via email. PLCopen starts new working group on Industry 4. Example 1 TwinCAT 3. One of them is abstract factorywhich is employed in the following example.
By continuing to use this website, you agree to their use. This layer is however an abstract one. HW classification of faults. Email required Address never made public.
IEC The ‘Abstract Factory’ Pattern | Stefan Henneken
SW safety validation planning. The instance variable is constrained by a specific type. Design requirements specification contents. Fill in your details below or click an icon to log in: As an example, a small PLC library for message logging is created. HW design, development and validation planning.
In order to simplify an access to the Write method of the respective logger block, the interface ILogger is defined. In this way, each variant has its own function block which contains the Write method. Thus, functionality is added to the function block through this reference. This is possible, because all function blocks implement the interface ILogger. The Write method of the logger can be accessed through this interface. The first most obvious step implicates developing a function block for logging or messaging.
Thus, the function block is capable to store the messages in different file formats. As the example shows, a class factory helps by implementing this Open Closed Principle. Interfaces, inheritance and dynamic memory management offer entirely new approaches in design of PLC libraries. At the same time, the extension modules contain only the adjustments of the original functionality. The left section represents the blocks, which can be located in a PLC library.
For example, this will be the case when the function block is located in a library and the access to the source code is thus not possible. Management of functional safety. Conformance to this standard. Write ‘Hello’ ; However, if the user would like to use optionally a CSV or XML file instead of the simple text file, the developer should expand the block.
Techniques and measures to prevent the introduction of faults in ASICs.
Variant 1: A simple function block
Example 2 TwinCAT 3. One of these principles is Open Closed Priciple, i. A factory can be implemented in different ways.
Following these principles should help to keep software structure clean. Ieec instances of a function block have to be created, the exact type of the 61113-6 block should be known before compiling. The implementation of the new function blocks is very simple: A simple function block The first most obvious step implicates developing a function block for logging or messaging. This is possible, because the dependencies of the function blocks between themselves were changed.
Thus, a strong dependency exists between these function blocks. This method returns the interface ILoggerbehind which the Write method of the actual logger is located.
For this purpose, two steps are necessary: Fault insertion test requirements.
In the Write method, an IF statement distinguishes different variants and calls the compatible private method respectively.
The result is a function block, which covers all necessary cases internally. ASIC design and development.
Two parameters define the user name and the password, while the iiec one contains connection data for the database. The dynamically created function block is assigned to the variable ipLogger in lines 14, 17 and Since the class factory always supplies the GetLogger method in this example, it is derived from an abstract base function block, which specifies this method.
The interface ILogger simplifies developing further variants. The objective of this part is: HW requirements for the control of systematic faults.