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FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
15 External FX I/O Device – FNC 70 to FNC 79
15.6 FNC 75 – ARWS / Arrow Switch
Cautions
1. Setting of the parameter "n"
Refer to the explanation of parameter setting in the SEGL (FNC 74) instruction. The setting range is from 0 to 3 for the
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 only be used 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
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