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9.5 Programming Examples
KV-10/80 Series Only
KV-300
KV-10/80
Chapter 9 KV-AD4/DA4 Analog I/O Unit
1-361
1
9
Writing Data to be Analog-output
This sample program calculates the value of the voltage to be output, and writes the
digital data to the data memory for D/A conversion. Data that has been written to the
data memory for D/A conversion is output as analog data.
Conditions
Data that has been written to DM0000 is converted to digital data for analog
output.
The digital data is sent to analog output V0 on the KV-DA4.
(Digital data is written to data memory DM0996.)
+7.5 V is output when input 0000 is ON.
-7.5 V is output when input 0001 is ON.
Ladder diagram
1. DM0996 is initialized when the power is turned ON.
(That is, #2000 is written to DM0996.)
2. #7500 (7.5 V) is written to DM0000.
3. (DM0000 ÷ 5 mV + 2000) is calculated when input 0000 is ON, and the calcula-
tion result is written to DM0001.
4. (2000 - (DM000 ÷ 5 mV)) is calculated when input 0001 is ON, and the calcula-
tion result is written to DM0001.
5. 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.
6. The output data will be updated at the rising edge of special utility relay 2800.
2008
#02000
LDA
DM0996
STA
1000
2007
#07500
DM0000
DW
0000
#00000
LDA
TM00
STA
#00005
DIV
#02000
ADD
DM0001
STA
1200
DIFU
DM0100
STA
#02000
LDA
DM0100
SUB
DM0001
STA
1201
DIFU
DM0000
LDA
0001
1000
1200
1201
#00000
LDA
TM00
STA
#00005
DIV
DM0000
LDA
2800
( )
2002 2011
DM0001
LDA
#04095
CMP
DM0001
LDA
DM0996
STA
1
2
3
4
5
6
( )
KVHKA Chap 09.p65 08.3.11, 11:20 AM361
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