Creating a new module from scratch - overview

Add and modify an analog input function block

  1. In the Palette view, select the IO palette. A list of function blocks related to I/O appears.
  2. Select the Analog Input (AI) function block from the palette, and then drag it onto the Function Block diagram.
  3. To find out more about the AI function block, select and right-click the block, and then click Help on the menu.

    DeltaV Books Online opens to a topic about the AI block. After reading about the function block, close DeltaV Books Online and return to Control Studio.

  4. Make sure the block is selected.
  5. In the list of parameters, double-click HI_HI_LIM (or right-click it and then select Properties).
  6. In the Properties dialog, change the value to 1000 and click OK.
  7. Double-click the IO_IN parameter.
  8. In the Properties dialog, enter the Device Signal Tag, LT-1 (for the level transmitter), and then click OK. The system selects the default parameter.

    In the Parameter list, note that the parameter named L_TYPE (linearization type) has a default value of Indirect. This must remain Indirect for you to be able to define the Engineering Units of the input.

  9. To set the Engineering Units (EU) and the scale, double-click the OUT_SCALE parameter.

  10. Modify OUT_SCALE as follows:

    • Change the 100% scale from 100 to 10000 (for 10,000 gallons).

    • For Engineering unit, select gal (for gallons).

  11. Click OK.

For our example, we want to make the output value easy to reference systemwide. Promoting the parameter to the module level allows the value to be referenced throughout the system as LI-101/PV rather than LI-101/AI1/OUT.