Auto Tuning; Limit Cycle Method; Parameters Set In Auto Tuning (Of Limit Cycle Method - Mitsubishi MELSEC-F FX3U Series User Manual

FX /FX Series PLC User's Manual - Analog Control Edition
3U 3UC
PID Instruction (FNC 88)
4.

Auto Tuning

This chapter describes the auto-tuning function of PID instruction.
The auto-tuning function will automatically set the important constants, such as the proportional gain and the
integral time, to ensure optimum PID control.
There are two auto-tuning methods: limit cycle method and step response method.
4.1

Limit Cycle Method

4.1.1

Parameters set in auto tuning (of limit cycle method)

Parameter
Proportional gain (K
Integral time (T )
I
Differential time (T
G-18
Setting position
)
P
)
D
+3
S
3
S S +4
3 3
S S +6
3 3
4 Auto Tuning
4.1 Limit Cycle Method