KEYENCE Visual KV Series - Manual (Page 377)

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 AM 353