KEYENCE Visual KV Series - Manual (Page 387)

9.5 Programming Examples KV-10/80 Series Only
KV
-300
KV-10/80
Chapter 9 KV-AD4/DA4 Analog I/O Unit
1-363
1
9
Example 2: Outputting Analog Current (4 to 20 mA)
• Data that has been written to DM0000 is converted to digital data for analog
output.
• The digital data is sent to analog output I0 on the KV-DA4.
(Digital data is written to data memory DM0996.)
• 4 mA is output when input 0000 is ON.
• 20 mA is output when input 0000 is OFF.
1. #4000 is written to DM0000 when input 0000 is ON.
2. #20000 is written to DM0000 when input 0000 is OFF.
3. ((DM0000
÷ 4 µA) - 1000) is calculated, and the calculation result is written to
DM0001.
4. Before the digital data is written to data memory for D/A conversion, check that
the data is #4095 or less.
Note: An unsteady value will be output if a value outside the range 0 to 4095 is
written to data memory for D/A conversion.
5. The output data will be updated at the rising edge of special utility relay 2800. (As
internal relay 1000 switches ON/OFF at each scan, the output data will be
updated every two scans.)
Note: In the case of current output, DM0996 need not be initialized (#2000 written to
DM0996) when the power is turned ON.
0000 #04000
DW
0000
DM0000
#20000
DM0000
DW
2002 DM0000
LDA
#00004
DIV
DM0001
STA
#01000
SUB
1000
1000
1000
2800
2002 2011 DM0001
LDA
#04095
CMP
DM0001
LDA
DM0996
STA
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3
4
5
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KVHKA Chap 09.p65 08.3.11, 11:20 AM 363