Mitsubishi Electric MELSEC FX3U Programming Manual page 450

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2) Specification of the number of sets ("n")
- When using one set of 4 digits [n = k1]
A 4-digit BCD digital switch connected to
+3, and stored in the binary format to
D
1
- When using two sets of 4 digits [n = k2]
A 4-digit BCD digital switch connected to
+3, and stored in the binary format to
D
1
A 4-digit BCD digital switch connected to
to +3, and stored in the binary format to
D
1
Related devices
Device
Instruction execution
M8029
Cautions
1. When the command contact turns OFF
Though the contents of
2. Number of occupied devices
1) When two sets of 4 digits (n = K2) are used, two devices are occupied starting from
2) When one set of 4 digits is used, four devices are occupied starting from
is used, eight devices are occupied starting from
3. When connecting a digital switch of up to 3 digits
It is not necessary to wire the strobe signal (output for digit specification)
unused digits are occupied also by this instruction, however, they cannot be used for any other purpose.
Make sure to leave unused outputs vacant.
4. Transistor output type is recommended
For continuously receiving digital switch values, make sure to use a transistor output type PLC.
→ For a relay type PLC, refer to "How to use this instruction in a relay output type PLC" later.
5. Digital switches
Use BCD output type digital switches.
Program example
In the program example shown below, digital switches are connected to inputs starting from X010 and outputs
from Y010.
1. Program
X000
FNC 72
DSW
448
→ For the instruction execution complete flag use method, refer to Subsection 6.5.2.
Name
OFF: Data is being output to
ON: A cycle operation of outputting data to
complete flag
digits) is completed.
do not change, all of
D
2
S D
1
X010 Y010
15 External FX I/O Device – FNC 70 to FNC 79
15.3 FNC 72 – DSW / Digital Switch (Thumbwheel Input)
to +3 is read in turn by the strobe signal
S S
.
D
2
to +3 is read in turn by the strobe signal
S S
.
D
2
+4 to +7 is read in turn by the strobe signal
S S
+1.
D
2
Description
to
D
1
to
D D
1 1
.
S
D
n
2
D 0 K 1
+3 or the instruction is not executed yet.
D
1
to +3 (scan of the 1st to 4th
D D
1 1
+3 turn OFF.
D
2
. When two sets of 4 digits
S
to unused digits. Because
D
1
to
D
1
to
D
1
D
1
.