Instructions
9.4 PID basic functions
PID control
492 Function Manual, 03/2017, A5E35300227-AC
CON_ZONE 182.0 REAL 100.0 If the control deviation is greater than the control zone band, the high
output value limit is output as output value.
If the control deviation is less than the negative control zone band, the
low output value limit is output as the output value.
The valid values depend on the sensors used.
You can use CONZ_ON =TRUE to enable the control zone.
TUN_ON 186.1 BOOL FALSE If TUN_ON=TRUE, the output value is averaged until the output value
excitation TUN_DLMN is enabled either by a setpoint step-change or by
TUN_ST 186.2 BOOL FALSE If the setpoint is to remain constant during controller tuning at the oper-
ating point, a output value step-change by the amount of TUN_DLMN is
UNDO_PAR 186.3 BOOL FALSE Loads the controller parametersPFAC_SP, GAIN, TI, TD,
D_FCONZ_ON and CON_ZONE from the data structure PAR_SAVE
SAVE_PAR 186.4 BOOL FALSE Saves the controller parameters PFAC_SP, GAIN, TI, TD, D_F,
CONZ_ON and CON_ZONE in the data structure PAR_SAVE.
LOAD_PID 186.5 BOOL FALSE Loads the controller parametersGAIN, TI,TD depending on PID_ON
from the data structure PI_CON or PID_CON (only in manual mode)
PID_ON 186.6 BOOL TRUE At the PID_ON input, you can specify whether or not the tuned control-
ler will operate as a PI or PID controller.
• PID controller: PID_ON = TRUE
• PI controller: PID_ON = FALSE
With certain process types it is nevertheless possible that only a PI
controller will be designed despite PID_ON = TRUE.
GAIN_P 188.0 REAL 0.0 Identified process gain. In the case of process type I, GAIN_P tends to
be estimated too low.
TU 192.0 REAL 0.0 Identified time lag of the process.
TA 196.0 REAL 0.0
Identified recovery time of the process. In the case of process type I, TA
tends to be estimated too low.
KIG 200.0 REAL 0.0 Maximum process value rise at manipulated tag excitation from
0 to 100 % [1/s]
N_PTN 204.0 REAL 0.0 The parameter specifies the order of the process. "Non-integer values"
are also possible.
Values from 1.01 to 10.0 are permitted.
Time constants of a PTN model (practical values only for N_PTN >= 2).
Time from process excitation until the point of inflection.
P_INF 216.0 REAL 0.0 Process value change from process excitation until the point of inflec-
tion.
The valid values depend on the sensors used.
LMN0 220.0 REAL 0.0 Output value at the start of tuning
Detected in phase 1 (mean value).
Values from 0 to 100 % are permitted.
Process value at the start of tuning
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