Using PID basic functions
7.3 TCONT_CP
PID control
Function Manual, 03/2017, A5E35300227-AC
229
The left cipher of STATUS_H displays the tuning status
Default, i.e., new controller parameters have not (yet) been found.
Suitable control parameters found.
2xxxx Control parameters have been found via estimated values; check the control
response or check the STATUS_H diagnostic message and repeat controller
3xxxx
An operator error has occurred; check the STATUS_H diagnostic message and
repeat controller tuning.
The CYCLE and CYCLE_P sampling times were already checked in phase 1.
The following controller parameters are updated on TCONT_CP:
● P (proportional GAIN)
● I (integration time TI)
● D (derivative time TD)
● Weighting of the proportional action PFAC_SP
● Coefficient DT1 (D_F)
● Control zone on/off CONZ_ON
● Control zone width CON_ZONE
The control zone is only activated if the process type is suitable (process type I and II) and a
PID controller is 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 retrieved with UNDO_PAR. A PI parameter
record and a PID parameter record are saved additionally 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.
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