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497
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
16 External FX Device – FNC 80 to FNC 89
16.9 FNC 88 – PID / PID Control Loop
11
FNC3
0-F
NC3
9
R
otati
on and
Shif
t
12
FNC4
0-F
NC4
9
D
ata
O
per
ati
on
13
FN
C
50-FN
C
59
H
igh Speed
Pr
ocess
ing
14
FM
C
60-
FN
C
69
H
andy
In
st
ru
ct
ion
15
FNC7
0-F
N
C7
9
Ex
ter
nal
FX
I/O
D
evice
16
FN
C
80-FN
C
89
Ext
ernal FX
De
vic
e
17
FN
C
100-
FN
C
109
Da
ta
Transf
er 2
18
FN
C
110-
FN
C
139
Fl
oati
ng Poi
nt
19
FN
C
140
-F
N
C
14
9
Da
ta
O
per
ati
on 2
20
FN
C
150-
FN
C
159
Posit
ioning
C
ontr
ol
*1.
+20 to
+24 are occupied when any bit 1, 2 or 5 is set to "1" in
+1 for operation
setting (ACT).
+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 (PV).
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
Setting Value
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