Instructions

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Name
Type
Description
Values
Access
Property
Box
Write
ToFB
Read
FromFB
AT completed
BOOL
Flag: 0 – auto-tuning stopped
1 – auto-tuning started
0/1

Kp calculated
REAL
Calculated proportional gain
0…100

Ti calculated
REAL
Calculated integral time
-3.402823e+38…
3.402823e+38

Td calculated
REAL
Calculated derivative time
-3.402823e+38…
3.402823e+38

Tuning of a control loop is the adjustment of its control parameters (Kp, Ti, Td) to the op-
timum values for the desired control response.
Programmable tuning
Programmable loop tuning can be performed using the blocks WriteToFB and Read-
FromFB (sect. 7.7).
To write the parameters, use the block WriteToFB (Fig. 6.76) or Property Box (Fig. 6.77).
To read the parameters, use the block ReadFromFB (Fig. 6.76).
Fig. 6.76
Fig. 6.77
Auto-tuning
To use auto-tuning, add the block WriteToFB to the circuit program and set the reference
to the parameter Start AT of the PID block.
To start the auto-tuning, enable control (E = 1) and set the parameter Start AT = 1.