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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
15 External FX I/O Device – FNC 70 to FNC 79
15.6 FNC 75 – ARWS / Arrow Switch
11
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
Control
Cautions
1. Setting of the parameter "n"
Refer to the explanation of parameter setting in SEGL (FNC 74) instruction. The setting range is from 0 to 3 for ARWS
instruction.
→ For the parameter setting, refer to Subsection 15.5.2.
2. Output type of the PLC
Use a transistor output type PLC.
3. Scan time (operation cycle) and the display timing
ARWS instruction is executed in synchronization with the scan time (operation cycle) of the PLC.
For achieving a series of display, the scan time of the PLC should be 10 ms or more.
If the scan time is less than 10 ms, use the constant scan mode so that the scan time exceeds 10 ms.
4. Number of occupied devices
1) Four input devices are occupied starting from .
2) Eight output devices are occupied starting from .
5. Limitation in the number of the instruction
ARWS instruction can be used only once in a program.
When ARWS instruction should be used two or more times, use the indexing (V, Z) function.
Program example
1. When changing the timer number and displaying the current value
1) Specifying the timer number using a 3-digit digital switch
2) Setting the constant of the timer using the arrow switches
Explanation of operation
Every time the read/write key is pressed, the read/write LED lights alternately.
• In reading
Set the timer number using the digital switch, and then press the set switch (X003).
• In writing
Set a numeric value using the arrow switches while looking at the seven-segment display unit, and then press the
switch X003.
S
D
2
X013
X010
X011
X012
10
1
184
Y011
2
10
0
184
Y010
2
10
2
184
Y012
2
Y004
Y015
Y007 Y006 Y005
Read
Write
Y003
Read
8
Y000
Y001
Y002
Y014
1
2
4
X001
Set
Write
X004 X003 X002 X000