KEYENCE Visual KV Series - Manual (Page 380)

9.4 Programming KV-10/80 Series Only
KV
-300
KV-10/80
Chapter 9 KV-AD4/DA4 Analog I/O Unit 1-356
9
Writing Digital Data to Data Memory for D/A Conversion
This section describes how to write digital data after it has been converted from the
voltage or current to be output to data memory for D/A conversion on the CPU.
Data memory for D/A conversion on the CPU and special utility relays for D/A
conversion are used only when the KV-DA4 is connected to the CPU. This data
memory and special utility relays can be used as regular data memory and relays,
respectively, when the KV-DA4 is not connected to the CPU. When the KV-DA4 is
connected to the CPU, this data memory and special utility relays can be used only
for D/A conversion and not for other applications. If data memory for D/A conversion
and special utility relays for D/A conversion are used for other applications, this may
cause the KV-DA4 to malfunction .
The following table shows the correspondence between channels, data memory and
special utility relays for D/A conversion.
To output digital data as analog data, the digital data to be analog-output is first
written to data memory for D/A conversion, and then the special utility relays for D/A
conversion is turned ON matching the channel from which digital data is to be
output.
Note 1: The CPU transfers the data on the rising edge of the special utility relays for
D/A conversion. So, analog output will not change while the special utility relays for
D/A conversion stays ON.
Note 2: KV-DA4 outputs voltage 0V and current 4 mA when the power is turned ON.
Note 3: In the case of voltage output, set 0 V (digital data value 2000) and set the
special utility relays for D/A conversion to ON for each channel in use before the
data in data memory for D/A conversion is changed.
-10 to 0 V (less than digital data value 2000) will be output only when 0V (2000) is
set. Otherwise, -10 to 0 V will not be output.
Note 4: Leave unused terminals open at all times. KV-DA4 has voltage and current
output modes, and outputs preset data from both terminals at all times.
Note 5: The voltage and current of the same channel No. cannot be used simulta-
neously.
Data Memory for
D/A Conversion
Channel
Special Utility Relay for
D/A Conversion
CH0
CH1
CH2
CH3
DM0996 2800
DM0997
DM0998
DM0999
2801
2802
2803
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