Create the class-based module example

The following steps explain how to create and instance a simple class-based module.

1. In DeltaV Explorer, drag the ANALOG monitoring template in the library to the Example category under Control Module Classes to create a class.

2. Name the class F_C.

3. Open F_C in Control Studio.

4. Set the following parameters on the AI block as indicated:

       L_TYPE properties: 

           Named state: Direct

       OUT_SCALE properties: 

           Engineering unit descriptor: °F

5. Add a Calculation function block to the class and connect the output of the AI block to the input of the Calc block. The class should look similar to the following:

   

6. Select the Calc block, and then select Expressions from the context menu.

7. Enter the following in the Expression Editor:

   REM Two outputs: degrees F and C
   'OUT1.CV' := 'IN1.CV'; 
   'OUT2.CV' := ( 'IN1.CV' - 32 ) * 5 / 9;

   Note

   It is a good idea to always start an expression with a remark (REM). If the first line of the expression starts with a quote mark, the User-Defined export and import may not interpret the expression correctly. 

8. In the module's properties change the SubType to TEMPS_F_C.

   Note

   The SubType must be entered in all capital letters. The user-defined import uses the Subtype to identify the module templates when it creates modules.

9. In DeltaV Explorer, drag the class F_C to a category under Module Templates.

10. Rename the resulting module template to TEMPS_F_C.

11. Create a module by dragging the TEMPS_F_C template to AREA_A.

12. Rename the module to TEMP-101.