Siemens SIMATIC S7-1200 Function Manual page 491

Parameters Address Data type
QTUN_RUN 114.0
PI_CON 116.0
GAIN +0.0
TI +4.0
PID_CON 124.0
GAIN +0.0
TI +4.0
TD +8.0
PAR_SAVE 136.0
PFAC_SP +0.0
GAIN +4.0
TI +8.0
TD +12.0
D_F +16.0
CON_ZONE +20.0
CONZ_ON +24.0
PFAC_SP 162.0
GAIN 166.0
TI 170.0
TD 174.0
D_F 178.0
PID control
Function Manual, 03/2017, A5E35300227-AC
Default Description
BOOL 0 The tuning manipulated tag has been applied, tuning has started and is
still in phase 2 (searching for point of inflection).
STRUCT PI controller parameters
REAL 0.0 PI controller gain
%/phys. unit
REAL 0.0 s PI integration time [s]
STRUCT PID controller parameters
REAL 0.0 PID controller gain
REAL 0.0s PID integration time [s]
REAL 0.0s PID derivative action time [s]
STRUCT The PID parameters are saved in this structure.
REAL 1.0 Proportional factor for setpoint changes
Values from 0.0 to 1.0 are permitted.
REAL 0.0 Controller gain
%/phys. unit
REAL 40.0 s Integration time [s]
REAL 10.0 s Derivative action time (s)
REAL 5.0 Derivative factor
Values from 5.0 to 10.0 are permitted.
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
BOOL FALSE Enable control zone
REAL 1.0 PFAC_SP specifies the effective P-action when there is a setpoint
change. This is set between 0 and 1.
•
•
Values from 0.0 to 1.0 are permitted.
REAL 2.0 The "Proportional gain" input specifies controller amplification. The
direction of control can be reversed by giving GAIN a negative sign.
%/phys. unit
REAL 40.0 s The "Integration time" (integral-action time) input defines the integrator's
time response.
REAL 10.0 s The "Derivative-action time" (rate time) input decides the time response
of the differentiator.
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.
1: P-action has full effect if the setpoint changes.
0: P-action has no effect if the setpoint changes.
Instructions
9.4 PID basic functions
491