Chapter 6 Description of Function Codes
Group F10: Process Control PID Function
PID control is a general process control method. By performing proportional, integral and
differential operations on the difference between the feedback signal and the target signal, it
adjusts the output frequency and constitutes a feedback system to stabilize the controlled
counter around the target value.
It is applied to process control such as flow control, pressure control and temperature control.
The following figure shows the principle block diagram of PID control.
F
-
Target
+
PID contro
l
set
frequency
output
frequency
Feedback
control
algorithm
Filter
P
M
Fig.6-28 Principle block diagram
of PID
control
Function
code
Name
Description
(setting range)
Factory
Default
Change
F10.00
PID setting source
0: Keypad (F10.01)
1: Analog AI1
2: Analog AI2
3: Analog AI3
4: Pulse setting (HDI)
5: Rs485 communication
setting
6: Multi-speed command
7:Panel potentiometer setting
0
※
F10.01
Keyboard preset PID
given
0.0~F10.04 (PID given
feedback range)
5.0
※
F00.06 is used to select the channel of target process PID setting. The PID setting is a relat-
ive value and ranges from 0.0% to 100.0%. The PID feedback is also a relative value. The
purpose of PID control is to make the PID setting and PID feedback equal.
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h
a
p
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