How to indirectly address I/O fields in WinCC - Database & Sql Blog Articles

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Question: How do you indirectly address an I/O field in WinCC?
Answer: To be indirectly addressed, you must define a dynamic string variable. This string variable contains the name of another variable that causes the property to be modified. By changing the name in this string variable, you can dynamically access different variables.

Example:

1. Create a new project.

2. Create a string variable "var_string" and some variables "var_1"..."var_x" with variable types of integer or float.

3. Open a new picture in the Graphics Designer.

4. Place some I/O fields "IOfield_1"..."IOfield_x" in the diagram and link them to integer or floating point variables. These I/O fields are for entering test data.

5. Place another I/O field "IOfield_string" in the diagram. Link this field to a string variable. This I/O field is for entering the variables to be displayed. Note: Make sure the "Data Format" property of "Input/output" is set to "String" (string) in the object properties.

6. Place another I/O field "IOfield_output" in the diagram. This field is also linked to a string variable, and the indirect addressing check mark is activated. Here the "Data format" attribute is set to "Decimal" in the object properties.

7. Save graphics and projects.

8. Enter different integer and floating point values ​​in the I/O field "IOfield_1"..."IOfield_x".

9. Then enter the variable name of the content you want to display in the I/O field "IOfield_output" in the I/O field "IOfield_string".