Program Example Of Auto-Tuning (Step Response Method) And Pid Control - Mitsubishi Electric FX3G User Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U
PID Instruction (FNC 88)
5.2

Program example of auto-tuning (step response method) and PID control

Initial pulse
M8002
PID control is started
after auto-tuning
X010
PID control is started
(without auto-tuning)
X011
Auto-tuning ON flag
M1
Initial pulse
M8002
RUN monitor
M8000
Initial pulse
M8002
PID control is
PID control is started
started after
(without auto-tuning)
auto-tuning
X010
PID control is started
(without auto-tuning)
X11
PID control is
started after
auto-tuning
X10
M-24
PLC User's Manual - Analog Control Edition
3UC
FNC 12
MOV
FNC 12
MOV
FNC 12
MOV
FNC 12
MOV
FNC 12
MOV
Auto-tuning setting flag
M0
FNC 12
MOV
FNC 12
MOV
FNC 12
MOV
FNC 12
MOVP
FNC 79
K 0 K 0
TO
FNC 78
K 0 K 10
FROM
X011
FNC 88
D500 D501
PID
5 Example of Practical Programs (for Step Response Method)
5.2 Program example of auto-tuning (step response method) and PID control
The target value is set (to 50 °C).
K500 D500
The input filter constant () is set
K 70 D512
(to 70 %).
The differential gain (K
K 0 D515
(to 0 %).
The output value upper limit is set
K2000 D532
(to ON for 2 sec).
The output value lower limit is set
K 0 D533
(to ON for 0 sec).
The auto-tuning setting is started.
PLS M0
Auto-tuning ON flag
SET M1
The sampling time (Ts) for auto-
K3000 D510
tuning is set (to 3 sec).
Operation setting (ACT)
H0031 D511
Auto-tuning is started.
The output value for auto-tuning is
K1800 D502
set (to ON for 1.8 sec).
The sampling time (Ts) for normal
K500 D510
operation is set (to 500 ms).
The mode of FX
Ch 1: Unused
H3303 K 1
Ch 2: K type
Data is read from the channel 2 in
D501 K 1
FX
The PID operation is initialized.
RST D502
PID instruction is driven.
D510 D502
The PID operation is executed.
M3
) is set
D
-4AD-TC is set.
2N
Ch 3: Unused
Ch 4: Unused
-4AD-TC.
2N