7 Applied Instructions
7.6 High Speed Processing
316
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
3. Restrictions to target devices
S1: Refer to item 1 of "Cautions".
S2: Applicable only to the FX
3U, FX3UC and FX3G PLCs.
S3: Applicable only to the FX
3U and FX3UC PLCs.
("Y002" cannot be used for the 14- or 24-type FX
3G PLC.)
(Special high speed output adapters can be connected only to the FX
3U PLC.)
4. Cautions on using special high speed output adapters
→ Refer to item 7 in 7.6.9 "Cautions".
Program examples
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%.
When the contents of D10 exceed "50", it becomes an error.
In this program example, the FX
3U series main unit (sink output) is used. For wiring details, refer to the
manual of the PLC used.
Example of smoothing circuit
X0
D10
50ms
Y000
PWM
EN
s1
s2
ENO
d
D10
K50
Y000
[ST]
PWM(X0,D10,K50,Y000);
[Structured ladder]
Y000
COM1
Y001 Y002 Y003
PLC
510Ω
12V
1kΩ
1kΩ
1kΩ
1kΩ
P
22Ω
E
R
(1kΩ
τ
×
τ
τ
≤
)
e
V
+
C
470µF
10V
5V
R>>P
=R(k ) C(µF)=470ms>>To
The time constant of the filter should be considerably larger than the pulse cycle T0.
The ripple value " e" in the mean output current "e" is approximately " ".
e
Δ
e
Δ
To
0V 24V
Ω
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