Overriding I/O Points

In the following procedure, we override the current value of the tank level with a false value and watch the control system respond.

1. On the main window, click the Tools menu and select Cross Reference Table, or click the appropriate icon ().

2. Click the row containing the VTL1.OP command in the To Symbol.

3. In the XRef Editor window toolbar, click the Override button.

   

4. Set the Mature Value to 1 using the spin button.

5. Click the Activate button. The demand to VTL1 increases to correct the supposed error in tank level.

6. Click the Save button located next to Activate (we will use the saved malfunction in an upcoming section).

7. In the Choose a System dialog box, select Tank Level Control and click OK.

   

8. Click the Deactivate button to discontinue override.