451
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
16 External FX Device – FNC 80 to FNC 89
16.7 FNC 88 – PID / PID Control Loop
11
FN
C30-
FN
C39
R
o
ta
tion and
Sh
ift
12
FNC
4
0
-FNC49
D
a
ta
Op
e
ra
tio
n
13
FNC5
0
-FNC5
9
H
igh Speed
Pr
ocessi
ng
14
FM
C6
0
-F
NC6
9
H
and
y
In
st
ru
cti
o
n
15
FNC7
0
-FNC7
9
Ex
te
rn
a
l F
X
I
/O
D
evi
ce
16
FNC8
0
-FNC8
9
Ext
e
rnal
FX
D
evi
ce
17
F
N
C1
00
-F
NC
10
9
Da
ta
Tr
ansf
e
r 2
18
FN
C
110-FN
C
13
9
Fl
oat
ing P
o
in
t
19
FN
C
140-FN
C
149
Da
ta
O
per
at
io
n
2
20
FN
C
15
0-F
N
C
159
P
o
si
tioni
ng
C
ont
ro
l
*1.
+20 to
+24 are occupied when bit 1, bit 2 or bit 5 is set to "1" in
+1 for operation
setting (ACT).
+6
Derivative time (TD)
0 to 32767 (
×
10 ms)
When "0" is set, the derivative operation is
not executed.
+7
:
+19
These devices are occupied for internal processing in PID control loop. Do not change the data.
+20
*1
Input variation
(incremental) alarm set
value
0 to 32767
It is valid when bit 1 is set to "1" in
+1
for the operation setting (ACT).
+21
*1
Input variation
(decremental) alarm set
value
0 to 32767
It is valid when bit 1 is set to "1" in
+1
for the operation setting (ACT).
+22
*1
Output variation
(incremental) alarm set
value
0 to 32767
It is valid when bit 2 is set to "1" and bit 5 is
set to "0" in
+1 for the operation
setting (ACT).
Output upper limit set value
−
32768 to 32767
It is valid when bit 2 is set to "0" and bit 5 is
set to "1" in
+1 for the operation
setting (ACT).
+23
*1
Output variation
(decremental) alarm set
value
0 to 32767
It is valid when bit 2 is set to "1" and bit 5 is
set to "0" in
+1 for the operation
setting (ACT).
Output lower limit set value
−
32768 to 32767
It is valid when bit 2 is set to "0" and bit 5 is
set to "1" in
+1 for the operation
setting (ACT).
+24
*1
Alarm output
bit0
0: Input variation (incremental) is
not exceeded.
1: Input variation (incremental) is
exceeded.
It is valid when bit 1 is set to "1" or bit 2 is set
to "1" in
+1 for the operation setting
(ACT).
bit1
0: Input variation (decremental) is
not exceeded.
1: Input variation (decremental) is
exceeded.
bit2
0: Output variation (incremental) is
not exceeded.
1: Output variation (incremental) is
exceeded.
bit3
0: Output variation (decremental) is
not exceeded.
1: Output variation (decremental) is
exceeded.
The setting below is required when the limit cycle method is used (when bit 6 is set to "ON" in the operation setting (ACT)).
+25
PV value threshold
(hysteresis) width (SHPV)
Set it according to the fluctuation of
the measured value (MV).
They are occupied when bit 6 is set to "ON
(limit cycle method)" in the operation setting
(ACT).
+26
Output value upper limit
(ULV)
Set the maximum value (ULV) of
the output value (MV).
+27
Output value lower limit
(LLV)
Set the minimum value (LLV) of the
output value (MV).
+28
Wait setting from end of
tuning cycle to start of PID
control (Kw)
−
50 to 32717%
Set item
Contents of setting
Remarks
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3