Keyence Visual KV Series Manual de usuario Pagina 377

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9.4 Programming
KV-10/80 Series Only
KV-300
KV-10/80
Chapter 9 KV-AD4/DA4 Analog I/O Unit
1-353
1
9
9.4.2 Programming the KV-DA4
This section describes the D/A conversion mechanism, how to convert the voltage
and current values to digital data for analog output, and how to output this digital
data as analog data from the KV-DA4.
D/A Conversion Mechanism
This item describes the D/A conversion mechanism on the KV-DA4. Check this
item before writing sequence programs for the KV-DA4.
External
instrument
Power
supply
unit
KV-DA4
CPU
Writing digital data
Sequence
program
Data memory for
D/A conversion
4
5
3
2
1
D/A
conversion
Analog
output
1. The voltage or current value to be output to external instruments is converted to
digital data by the sequence program on the CPU.
For details, see "Converting Digital Data to Voltage or Current Values to be Output" on page 1-
354.
2. The digital data on the channel to be converted is written to the data memory for
D/A conversion by the sequence program.
For details, see "Converting Digital Data to Voltage or Current Values to be Output" on page 1-
354.
3. The special utility relay for D/A conversion of the channel to be converted to
analog data is set to ON.
The special utility relay for D/A conversion acknowledges the request at the
rising edge of the relay.
For details, see "Writing Digital Data to Data Memory for D/A Conversion" on page 1-356.
The D/A conversion instruction is transferred to the KV-DA4.
4. KV-DA4 converts the digital data to analog voltage or current signals.
This operation is called "D/A conversion."
5. The analog signals are output to the external instrument from the KV-DA4.
This operation is called "analog output."
KVHKA Chap 09.p65 08.3.11, 11:20 AM353
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