A/D Conversion Data - Toshiba AD268 User Manual

5. I/O Allocation and Programming

5.2 A/D conversion data

The analog signals received by the AD268 are converted into the digital data in this module.
These converted digital data are read by T2 CPU in the batch I/O processing and stored in the
assigned input registers as follows.
XW(n) ........ A/D conversion data for channel 1
XW(n+1) .... A/D conversion data for channel 2
XW(n+2) .... A/D conversion data for channel 3
XW(n+3) .... A/D conversion data for channel 4
XW(n+4) .... A/D conversion data for channel 5
XW(n+5) .... A/D conversion data for channel 6
XW(n+6) .... A/D conversion data for channel 7
XW(n+7) .... A/D conversion data for channel 8
The conversion data stored in the XW register is dependent on the input type as follows.
10V range:
Upper limit
Full scale (positive)
Full scale (negative)
Lower limit
-10.2V
H8300
-32000
18
Analog I/O Modules (AD268 / DA264 / TC218)
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Input voltage
+10.2 V
:
+10 V
:
+0.3125 mV
0 0 V
-0.3125 mV
:
-10 V
:
-10.2 V
Digital value
H3FFF
16383
0
-5.12V
HC000
-16384
-10V

A/D conversion data

Hexadecimal
H7F80
:
H7D00
:
H0001
H0000
HFFFF
:
H8300
:
H8080
+10V
H7D00
32000
Analog input
+5.1196V +10.2V
PART 1 AD268
Resolution
Integer
32640
:
32000
:
1
0 0.3125 mV / bit
-1
:
-32000
:
-32640
D = 3200 A
D: Digital data
A: Analog signal (V)