408
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
15 External FX I/O Device – FNC 70 to FNC 79
15.3 FNC 72 – DSW / Digital Switch (Thumbwheel Input)
2. Connection diagram
This connection diagram shows an example of the FX
3UC
-32MT-LT (sink input/sink output).
For the wiring, refer to the following manual of the used PLC.
→
FX
3U
Hardware Manual
3. Timing chart
While X000 is ON, Y010 to Y013 turn ON in turn at every 100 ms. After one cycle is finished, the execution
complete flag M8029 turns ON.
4. How to use this instruction in a relay output type PLC
By providing a "digital switch read input", this instruction can be used in a relay output type PLC.
DSW (FNC 72) instruction executes a series of operation only when the pushbutton switch (X000) is pressed.
Accordingly, with regard to this instruction, it is not necessary to consider the product life even if Y010 to Y013
are relay outputs.
1) While M0 (digital switch read input) is ON, DSW (FNC 72) is driven.
2) DSW (FNC 72) completes one cycle of operation, and remains driven until the execution complete flag
(M8029) turns ON.
10
3
10
2
10
1
10
0
BCD type
digital
switch
10
3
10
2
10
1
10
0
To
second
set
Diode of
0.1 A, 50 V
is required.
BCD type
digital
switch
4
3
2
1
To
second
set
8
4
2
1
COM X010 X011 X012 X013
X015
X014
X016 X017
COM1
Y010 Y011 Y012 Y013
Inputs of first set
PLC
1
2
4
8
10
3
10
2
10
1
10
0
Inputs of second set
X000
Y010
Y011
Y012
Y013
M8029 Complete flag
Repeated
operation
0.1 sec
0.1 sec
0.1 sec
0.1 sec
0.1 sec
0.1 sec
Pause
M 0
X000
SET
M 0
FNC 72
DSW
X010
Y010
D 0
K 1
M8029
RST
M 0
