National-instruments FP-3000 Manual de usuario descargar pdf (Pagina 48)

Chapter 3 Example Applications

Once the block goes to

Auto

, it is fully operational. You can adjust the Set

Point by writing a value between 0 and 100 (percent) to SP. The current

flow through the heating element will vary accordingly.

If you are only interested in making the FP-3000 output current and not

interested in closed loop control, you are finished with this example.

Close any open block configuration windows before you proceed to the

next section.

PID Control

Create a PID Block

Now that your input and output blocks are functioning, you can “close the

loop” by creating a control block and putting the loop under automatic

control. To create a PID block, follow these steps:

1. Right-click on the FP-3000 in the configuration tree.

2. Select Instantiate New Block. This causes a dialog box to appear that

lists all of the blocks supported by the FP-3000 and allows them to be

instantiated.

3. Select Pid Block from the list, then click on the OK button.

Assign a Tag to the New Block

By default, new blocks are created without a tag. To assign a tag, follow

these steps:

1. Right-click on ---Notag---(PIDC)in the configuration tree, then

select Set Tag.

2. Enter the tag you choose in the dialog box. The tag can be up to

32 characters in length and should not contain the dot (“.”) character.

3. Make sure Set to OOS Mode is checked.

4. Click on Set.

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National-instruments FP-3000 Manual de usuario Pagina 48