Result Of The Tuning; Tuning Stopped By The Operator - Siemens SIMATIC Manual

3.9

Result of the Tuning

The left digit of STATUS_H indicates the tuning status (for a detailed table, see
Appendix A.4, Page A-22):
STATUS_H
0
10000
2xxxx
3xxxx
The following control parameters are updated in FB 58 "TCONT_CP":
•
Factor for attenuating the P-action PFAC_SP = 0.8
•
Controller gain GAIN
•
Integral time TI
•
Derivative time TD
•
Derivative factor D_F = 5.0
•
Control zone on/off CONZ_ON
•
Control zone width CON_ZONE
The control zone is activated only if the process type is suitable (process type I and
II) and a PID controller is being used (CONZ_ON = TRUE).
Depending on PID_ON, control is implemented either with a PI or a PID controller.
The old controller parameters are saved and can be reactivated with UNDO_PAR.
A PI and PID parameter set is also saved in the PI_CON and PID_CON structures.
Using LOAD_PID and making a suitable setting for PID_ON, it is also possible to
switch later between the tuned PI or PID parameters.
The CYCLE and CYCLE_P sampling times were already checked in Phase 1.
3.10

Tuning Stopped by the Operator

Stopping Tuning Before Completion
In Phase 1, 2 or 3, you can stop the tuning by resetting TUN_ON to FALSE without
new parameters being calculated. The controller starts in automatic mode with
LMN = LMN0 + TUN_DLMN. If the controller was in manual mode prior to the
tuning, the old manual value will be output.
If the tuning is stopped during Phase 4, 5 or 7 with TUN_ON = FALSE, the control
parameters calculated to this point are retained.
PID Temperature Control
A5E00125039-02
Result:
Default or no new controller parameters have been found (yet).
Suitable control parameters found
Control parameters found using estimated values; check the control
response or check the STATUS_H diagnostic message and repeat the
controller tuning.
Operator input error occurred; check the STATUS_H diagnostic
message and repeat the controller tuning.
Controller Tuning in FB 58 "TCONT_CP"
3-11