Auto-Tuning; Limit Cycle Method; Parameters Set In Auto-Tuning (Of Limit Cycle Method; Auto-Tuning Procedure - Mitsubishi Electric MELSEC-FX3S Series Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U
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
M-18
PLC User's Manual - Analog Control Edition
3UC
Setting position
)
P
)
D
S +3
3
S
+4
3
S +6
3
4 Auto-Tuning
4.1 Limit Cycle Method