Operation Procedures - Omron CX-PROCESS TOOL V5.2 - 12-2009 Operation Manual

Tuning

4-7-5 Operation Procedures

Auto-tuning (AT)
1, 2, 3...
Changing P, I, and D
1, 2, 3...
302
It is possible to automatically calculate and store the PID constants used for Ba-
sic PID (011) or Advanced PID (012). This function is called auto-tuning (AT). For
details of the AT function, refer to the section on Basic PID (011) in the Function
Block Reference Manual for the Loop Controller (Loop Control Units: W375,
LCBjjs: W407). AT can be set in the same way as the other settings, as shown
below.
1. If the value for AT displayed in the upper-left region of the Tuning Screen is 0,
then AT is not being executed.
2. Click AT.
The Change Data Dialog Box shown below will be displayed.
3. To execute AT, input 1 in the New Data Field.
4. Click the OK Button. AT will be executed (see note). The value for AT dis-
played in the upper-left region of the Tuning Screen will change to 1.
5. When the PID constants have been calculated and stored and AT has been
completed, the value for AT displayed in the upper-left region of the Tuning
Screen will return to 0.
Note Execution of AT can be cancelled from the above dialog box by inputting 0 in the
New Data Field and clicking the OK Button. (The value for AT displayed in the
upper-left region of the Tuning Screen will return to 0.)
The following example shows how to change P (the proportional band).
1. Click Proportional Band (P) displayed in the upper center of the screen.
The Change Data Dialog Box will be displayed.
2. Click the "New data" input field.
Section 4-7