KEYENCE Visual KV Series - Manual (Page 385)

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 AM 361