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Process control instructions
Ts
ControlMode
AT_Bias
AT_Correction_Kp
AT_Correction_Ti
AT_Correction_Td
AT_Progress
WorkingArea
When the execution condition has turned on, the operation work area is initialized.
NOTE
When the execution condition turns to TRUE, the default value is set. The manipulated value MV
is only output in the range of the specified upper and lower limit.
Detailed information on the setting method:
PV_Band_WithFullOutput
Define the percentage of the set point value at which PID control should start. Below this level, output is at
100%.
For example, if PV_Band_WithFullOutput is set to 80% and the measured value (process value PV) is only at
50% of the set value, the output will be at 100%. It will remain at 100% until the measured value reaches 80% of
the set value, at which point PID control will start.
The amount of the percentage determines how quickly the set value will be reached.
Fine adjustment of auto-tuning
When auto-tuning has completed, the parameters for Kp, Ti and Td are stored in the elements of
F356_Parameters_Hold_DUT (see page 948). For fine adjustment, you can now correct the result of
auto-tuning with the parameters AT_Correction_Kp, AT_Correction_Ti and AT_Correction_Td.
EXAMPLE
Set AT_Correction_Kp to 200 (i.e. 200%): perform auto-tuning to correct Kp to double its value.
Set AT_Correction_Ti to 125 (i.e. 125%): perform auto-tuning to correct Ti to 1.25 times its value.
Set AT_Correction_Td to 75 (i.e. 75%): perform auto-tuning to correct Td to 0.75 times its value.
950
Sets the sampling time for updating the
measured input values.
Unit = 0.01s
Also sets the PWM output period.
0
Inverse PI-D control, e.g. heating
1
Forward PI-D control, e.g.
cooling
2
Inverse I-PD control, e.g. heating
3
Forward I-PD control, e.g.
cooling
Sets a bias value for performing
auto-tuning
Sets the correction value of the
auto-tuning result for Kp
Sets the correction value of the
auto-tuning result for Ti
Sets the correction value of the
auto-tuning result for Td
Stores the auto-tuning progress
Working area of up to 30 words for PID
processing and auto-tuning
100 (1s)
1–3000 (0.01–30s)
0
0–3
0
min. 0
125%
50–500%
200%
50–500%
100%
50–500%
0
0–5
0
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