Mitsubishi Electronics FX3G User Manual
382
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
13 High-Speed Processing – FNC 50 to FNC 59
13.9 FNC 58 – PWM / Pulse Width Modulation
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.
Only wire the appropriate output terminals.
Outputs in special high-speed output adapters and the main unit operate as shown below.
Only wire the appropriate 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 adapters
Output operation
Program example
When the contents of D10 are changed ranging from "0" to "50" in the program example shown below, the average
output from Y000 will be ranging from 0 to 100%.
An error will occur if the contents of D10 exceed 50.
In this program example the FX
output from Y000 will be ranging from 0 to 100%.
An error will occur if the contents of D10 exceed 50.
In this program example the FX
3U
series main unit (sink output) is used. For wiring details, refer to the Hardware
Edition of each PLC.
Example of smoothing circuit
R
>> P
τ = P(kΩ) C(µF) = 470ms >> T
0
The time constant 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"
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
"FP 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
"PLS 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
Do not use the PWM (FNC 58) instruction with relay-output type main units.
(Considerable output response delay may be generated, chattering may occur in
contacts, or the contact life may be shortened.)
(Considerable output response delay may be generated, chattering may occur in
contacts, or the contact life may be shortened.)
Triac output type main unit
Do not use the PWM (FNC 58) instruction with triac-output type main units.
(Considerable output response delay may be generated.)
(Considerable output response delay may be generated.)
Special high-speed output adapter
Use a transistor output type main unit.
Transistor output type main unit
Operated.
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
µF
10V
5V
1k
Ω
1k
Ω
1k
Ω
R
(1k
Ω)
P
22
Ω
24V
0V