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