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495
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
16.9
FNC 88 – PID / PID Control Loop
Outline
This instruction executes PID control which changes the output value according to the input variation.
→
For details, refer to the Analog Control Edition.
1. Instruction format
2. Set data
3. Applicable devices
S
: This function is supported only in FX
3U
/FX
3UC
PLCs.
Explanation of function and operation
1. 16-bit operation (PID)
When the target value
, measured value
, and parameters
to
+6 are set and a
program is executed, the operation result (MV) is stored to the output value
at every sampling time
.
Operand type
Description
Data type
Data register number storing the target value (SV)
16-bit binary
Data register number storing the measured value (PV)
16-bit binary
Data register number storing a parameter
16-bit binary
Data register number storing the output value (MV)
16-bit binary
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
X Y M T C S D
.b KnX KnY KnM KnS T C D R U
\G
V Z Modify K H
E
"
"
P
3 3
S
3 3
S
3 3
3 3
S
FNC 88
PID
−
Mnemonic
Operation Condition
16-bit Instruction
9 steps PID
Mnemonic
Operation Condition
Continuous
Operation
32-bit Instruction
S
1
S
1
S
1
S
2
S
3
S
1
D
S
1
S
1
S
1
S
2
S
2
S
3
S
1
D
S
1
S
2
S
3
S
3
D
S
3
Command
input
FNC 88
PID
S
3
S
2
S
1
D
Target value (SV)
Measured value (PV)
Parameter
Output value (MV)