Mitsubishi MELSEC-F FX3U Series User Manual

FX 3U /FX 3UC Series PLC User's Manual - Analog Control Edition
PID Instruction (FNC 88)
G-3
1 Outline
1.1 Outline of function
A
Common Items
B
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3U
-4DA-ADP
E
FX
3U
-4AD-PT
-ADP
F
FX
3U
-4AD-TC
-ADP
G
PID Instruction (FNC 88)
1. Outline
This chapter describes the outline of PID instruction (FNC88) for the FX3U/FX3UC Series PLC.
1.1 Outline of function
PID instruction orders the system to calculate the output (MV) value from the measurement (PV) value so that
combining the P (proportional) action, I (integral) action, and D (derivative) action can obtain the target (SV)
value. See diagram below.
1) Alarm output function
The alarm input can be set to ON for the input (measured value) variation or output (value) variation.
2) Setting the upper limit and lower limit of the output value
The upper limit and lower limit can be set for the output value.
3) Auto tuning function
The proportional gain (KP), integral time (TI) and differential time (TD) can be set automatically.
The limit cycle method or step response method can be selected.
4) Operation method of the PID instruction
PID speed type operation and measured value differential type operation are executed.
FX 3U /FX 3UC Series PLC
Controlled
object
Measurement value (PV)
Output value (MV)
Target value
(SV)
PID Instruction

Mitsubishi MELSEC-F FX3U Series Specifications

General

Brand	Mitsubishi
Model	MELSEC-F FX3U Series
Category	Controller
Language	English