Instructions

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Threshold range: 0…65535.
6.2.5 Analog
 PID controller (PID)
6.2.5.1 PID controller (PID)
Fig. 6.74
Fig. 6.75
The function block PID is used for implementation of the proportional-integral-derivative
control.
Table 6.10 PID block inputs/outputs
Name
Type
I/O
Description
Values
E
BOOL
I
Enable control (0 = Off, 1 = On). If disabled, the parameter
Pwr takes the value of the parameter Output safe state.
0/1
Pv
REAL
I
Process value
Sp
REAL
I
Setpoint
Pwr
REAL
O
Output power, %
0…100
Table 6.11 PID block parameters
Name
Type
Description
Values
Access
Property
Box
Write
ToFB
Read
FromFB
Control mode
BOOL
0 – Heating
– 1 – Cooling
0/1


Output safe
state
REAL
Output value when control is disa-
bled, %
0…100


Kp
REAL
Proportional gain, multiplication fac-
tor for proportional control
0…100


Ti (s)
REAL
Integral time, time constant for inte-
gral control in seconds
-3.402823e+38…
3.402823e+38


Td (s)
REAL
Derivative time, time constant for de-
rivative control in seconds
-3.402823e+38…
3..402823e+38


Output max.
REAL
Output upper limit, % (default 80)
0…100


Output min.
REAL
Output lower limit, % (default 20)
0…100


Start AT
BOOL
0 – stop auto-tuning
1 – start auto-tuning
0/1
