357
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
13 High Speed Processing – FNC 50 to FNC 59
13.9 FNC 58 – PWM / Pulse Width Modulation
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
4) When special high speed output adapters are connected, the same output numbers in the main unit are
assigned as shown in the table below.
Use only an output terminal. Do not perform wiring to the unused output terminals.
Outputs in special high speed output adapters and the main unit operate as shown below.
Assignment of output numbers in special high speed output adapter
Output operation
Program example
When the contents of D10 are changed in the range from "0" to "50" in the program example shown below,
the average output from Y000 will be in the range from 0 to 100%.
In this program example, the FX
3UC
-32MT-LT (sink input/sink output) is used. For the wiring, refer to the
following manual of the used PLC.
→
FX
3U
Hardware Manual
Example of smoothing circuit
Setting status of output
form setting switch
Signal name
Setting name in each
positioning instruction
Output number
1st unit
2nd unit
1st axis 2nd axis 3rd axis 4th axis
Set to "FP
x
RP" side
Forward rotation
pulse chain (FP)
Pulse output destination
Y000
Y001
Y002
Y003
Reverse rotation
pulse chain (RP)
Rotation direction signal
Y004
Y005
Y006
Y007
Set to "PLS
x
DIR" side
Pulse chain
Pulse output destination
Y000
Y001
Y002
Y003
Direction
Rotation direction signal
Y004
Y005
Y006
Y007
Output operation
Relay output type main unit
Outputs turn ON and OFF normally, but do not use PWM (FNC 58) instruction
because it does not support relay outputs.
(Do not use PWM instruction because considerable output response delay
may be generated, chattering may occur in contacts, or the contact life may be
shorter.)
Special high speed output adapter
Outputs turn ON and OFF normally.
X0
D10
K50
Y000
FNC 58
PWM
D10
50ms
Y000
Y000
COM1
Y001 Y002 Y003
PLC
510
Ω
12V
1k
Ω
E
e
V
+
C
470
µ
F
10V
5V
1k
Ω
1k
Ω
1k
Ω
R
(1k
Ω
)
P
22
Ω
The time constant t of the filter should be considerably larger than the pulse cycle T
0
.
The ripple value "
∆
e" in the mean output current "e" is approximately "
∆
e/e
≤
T
0
/
τ
".
R
>
P
τ
= P(k
Ω) ×
C(
µ
F) = 470ms
>
T
0
24V DC
Содержание FX3U Series
Страница 1: ...PROGRAMMING MANUAL Basic Applied Instructions Edition FX3U FX3UC SERIES PROGRAMMABLE CONTROLLERS ...
Страница 2: ......
Страница 889: ......