Siemens SIMATIC Manual page 63

Manual/Automatic Switchover
Step Activity
1 Switch to manual in the Commissioning dialog
and click the Send button.
2 Set a different value for the manual value and
click the Send button.
3 Return to the automatic mode and click the
Send button.
Changing Between PID and PI Parameters
Step Activity
1 Switch to manual in the Commissioning dialog
and click the Send button.
2 Open the VAT_StructPar variable table in the
SIMATIC Manager and click on Variable
Monitor.
3 Under "PID/PI Parameter Setting" in the
Commissioning dialog, select PI parameters
and click the Download button.
4 Under "PID/PI Parameter Setting", select PID
parameters and click the Download button.
5 Return to the automatic mode and click the
Send button.
PID Temperature Control
A5E00125039-02
Result:
The value of the manipulated variable
remains constant in the curve recorder.
You can now see the new manual value set
for the manipulated variable.
Based on the value of the manipulated
variable in the curve recorder, you can see
how the controller operates again in automatic
mode.
Result:
The value of the manipulated variable
remains constant in the curve recorder.
In the VAT_StructPar variable table, you can
see how the parameters of PI_CON were
transferred to the effective parameters.
In the VAT_StructPar variable table, you can
see how the parameters of PID_CON were
transferred to the effective parameters.
Based on the value of the manipulated
variable in the curve recorder, you can see
how the controller operates again in automatic
mode.
Getting Started
5-3