User’s Manual 45
PART 2 DA264 5. I/O Allocation and Programming
5.2 D/A conversion data
To output the desired analog signals from the DA264, simply write the appropriate data into the
assigned I/O registers YW(n) to YW(n+3) for the DA264.
The data of YW(n) to YW(n+3) are transferred to the DA264 at the T2’s batch I/O processing.
Then in the DA264, these D/A conversion data are converted into the analog signals and
output from the DA264.
The I/O register assignment is as follows.
YW(n) ........ D/A conversion data for channel 1
YW(n+1) .... D/A conversion data for channel 2
YW(n+2) .... D/A conversion data for channel 3
YW(n+3) .... D/A conversion data for channel 4
The conversion data to be written into the YW register is dependent on the output type as
follows.
±
±±
±10V range:
D/A conversion data
Hexadecimal I nteger Output voltage Resolution
Upper limit H7F80 32640 +10.2 V
:::
Full scale (positive) H7D00 32000 +10 V
:::
H0001 1 +0.3125 mV
0 H0000 0 0 V
HFFFF -1 -0.3125 mV
:::
Full scale (negative) H8300 -32000 -10 V
:::
Lower limit H8080 -32640 -10.2 V
0.3125 mV / bit
A = 0.3125 × D
D: Digital data
A: Analog signal (mV)
HC000
-16384
H8000
-32768 0H3FFF
16383 H7FFF
32767
Analog output value
+10V
H7D00
32000
+5.1196V
-5.12V
-10V
H8300
-32000
Digital data
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