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 TC218 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.
100mV input:
Upper limit
Full scale (positive)
Full scale (negative)
Lower limit
-102mV
H8300
-32000
-100mV
70
Analog I/O Modules (AD268 / DA264 / TC218)
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Input voltage
+102 mV
:
+100 mV
:
+3.125 V
0 0 V
-3.125 V
:
-100 mV
:
-102 mV
Digital value
H3FFF
16383
0
-51.2mV
+51.196mV
HC000
-16384
A/D conversion data
Hexadecimal
H7F80
:
H7D00
:
H0001
H0000
HFFFF
:
H8300
:
H8080
+100mV
H7D00
32000
Analog input
+102mV
PART 3 TC218
Resolution
Integer
32640
:
32000
:
1
0 3.125 V / bit
-1
:
-32000
:
-32640
D = 320 A
D: Digital data
A: Analog signal (mV)