Mitsubishi Electric MELSEC-FX3S Series Manual page 524

FX /FX /FX /FX /FX
3S 3G 3GC 3U
PID Instruction (FNC 88)
5.3
Program example of auto-tuning (step response method)
Auto-tuning is started.
X010
Auto-tuning is started.
M0
Initial pulse
M8002
RUN monitor
M8000
Auto-tuning is started.
X010
PID
operation
M1
PID
operation
M1
Auto-tuning ON flag
Auto-tuning is finished.
M-26
PLC User's Manual - Analog Control Edition
3UC
FNC 12
MOVP
FNC 12
MOV
FNC 12
MOVP
FNC 12
MOVP
FNC 12
MOVP
FNC 12
MOVP
FNC 12
MOVP
FNC 12
MOVP
FNC 79
K 0
TO
FNC 78
K 0 K 10
FROM
FNC 88
D500 D501
PID
FNC 12
MOV
M14
M2
5.3 Program example of auto-tuning (step response method)
K500 D500
K1800 D502
K3000 D510
H0031 D511
K 70 D512
K 0 D515
K2000 D532
K 0 D533
PLS M0
SET M1
K 0 H3303 K 1
D501 K 1
RST D502
D510 D502
D511 K2M10
PLF M2
RST M1
5 Example of Practical Programs (for Step Response Method)
The target value is set (to 50°C).
The output value for auto-tuning is
set (to ON for 1.8 sec).
The sampling time (Ts) is set
(to 3 sec).
Operation setting (ACT)
Auto-tuning is started.
The input filter constant (α) is set
(to 70%).
The differential gain (K
D
(to 0%).
The output value upper limit is set
(to ON for 2 sec).
The output value lower limit is set
(to ON for 0 sec).
Auto-tuning is started.
PID instruction operation
The mode of FX -4AD-TC is set.
2N
Ch 1: Unused Ch 3: Unused
Ch 2: K type Ch 4: Unused
Data is read from the channel 2
in FX -4AD-TC.
2N
The PID output is initialized.
PID instruction
Auto-tuning operation is
confirmed.
Auto-tuning is finished.
Auto-tuning is completed.
) is set