Mitsubishi Electronics FX3G Manuel D’Utilisation
479
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
16 External FX Device – FNC 80 to FNC 89
16.9 FNC 88 – PID / PID Control Loop
11
FN
C30
-FN
C3
C30
-FN
C3
9
R
ota
tion and
Shi
ft
ft
12
FN
C40-FN
C40-FN
C49
D
ata O
perati
perati
on
13
FNC
50-FNC
59
High-Speed
Proc
essing
14
FM
C60-FN
C60-FN
C69
H
andy
In
struction
15
FN
C70-FN
C70-FN
C79
E
xternal
F
X
I/O
De
vice
16
FNC
80-FNC
89
External
FX
Dev
ice
ice
17
FNC1
00-
FNC10
00-
FNC10
9
Dat
a
a
Transfer 2
18
FNC1
10-
FNC139
FNC139
Fl
oati
ng Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
Operation 2
20
FNC1
50-
FNC159
FNC159
Pos
itioning
itioning
Control
Cautions
1. When using two or more PID instructions
Two or more PID instructions can be executed at the same time. (There is no limitation in the number of loops.)
However, make sure that
However, make sure that
,
and other operands specified in each instruction are different to each other.
2. Number of devices occupied for parameters starting from
1) In the limit cycle method
- Twenty-nine devices are occupied from the head device specified in
.
2) In the step response method
- Operation setting (ACT): When bits 1, 2 and 5 are not all "0"
Twenty-five devices are occupied from the head device specified in
.
- Operation setting (ACT): When bits 1, 2 and 5 are all "0"
Twenty devices are occupied from the head device specified in
.
3. When specifying a device in the latched area backed up against power failure
For the output value (MV) in the PID instruction, specify a data register outside the latched area.
When specifying a data register in the latched area, make sure to clear the latched (backed up) contents when the
PLC mode is set to RUN using the following program.
Program example
When specifying a data register in the latched area, make sure to clear the latched (backed up) contents when the
PLC mode is set to RUN using the following program.
Program example
Error
When an operation error occurs, the special auxiliary relay M8067 turns ON, and the error code is stored in the special
data register D8067.
data register D8067.
→ For the error code, refer to Section 38.4.
S
3
D
S
3
S
3
S
3
S
3
M8002
Initial pulse
RST
D***
Data register number in the latched area specified in D