Instructions
9.4 PID basic functions
PID control
Function Manual, 03/2017, A5E35300227-AC
491
QTUN_RUN 114.0 BOOL 0 The tuning manipulated tag has been applied, tuning has started and is
still in phase 2 (searching for point of inflection).
PI_CON 116.0 STRUCT PI controller parameters
GAIN +0.0 REAL 0.0 PI controller gain
PID controller parameters
PID derivative action time [s]
The PID parameters are saved in this structure.
PFAC_SP +0.0 REAL 1.0 Proportional factor for setpoint changes
Values from 0.0 to 1.0 are permitted.
GAIN +4.0 REAL 0.0 Controller gain
Derivative action time (s)
D_F +16.0 REAL 5.0 Derivative factor
Values from 5.0 to 10.0 are permitted.
CON_ZONE +20.0 REAL 100.0 Control zone band
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.
CON_ZONE ≥ 0.0
PFAC_SP 162.0 REAL 1.0 PFAC_SP specifies the effective P-action when there is a setpoint
change. This is set between 0 and 1.
• 1: P-action has full effect if the setpoint changes.
• 0: P-action has no effect if the setpoint changes.
Values from 0.0 to 1.0 are permitted.
GAIN 166.0 REAL 2.0 The "Proportional gain" input specifies controller amplification. The
direction of control can be reversed by giving GAIN a negative sign.
TI 170.0 REAL 40.0 s The "Integration time" (integral-
action time) input defines the integrator's
time response.
TD 174.0 REAL 10.0 s The "Derivative-action time" (rate time) input decides the time response
D_F 178.0 REAL 5.0 The derivative factor decides the lag of the D-action.
D_F = derivative-action time/"Lag of the D-action"
Values from 5.0 to 10.0 are permitted.
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