Toshiba T2N - Manual (Page 52)

2.Specification
User’s manual 37
4-Channel Analog Input
(8-bit) (Continued)
250
200
150
100
50
0
(b) (c)
1 5
250 (a)
200
150
100
50
0
4 10
A/D Conversion
Digital Value
10(V)
Analog value
D = Digital Value
A = Analog Value
20(mA)
Analog value
(a) 4-20mA range : D = 15.625 x A-62.5
(b) 1-5V range : D = 62.5 x A-62.5
(c)
0-10V range : D = 25 x A
Data Format
F E D C B A 9 8 7 6 5 4 3 2 1 0
B * * * * * * * D D D D D D D D XW
D : Data bit (8 bits)
0-250 (H00-HFA)
(Over-voltage/over-current input 255 counts)
B : External line abnormal detection bit
0 = Normal
1 =Abnormal
* : Always 0
When all data bits are 0
When all data bits are 1
CH4
CH3
CH2
CH1
O F
XWn+3
XWn+2
XWn+1
XWn
4 words occupied
(X4W)
1. In the voltage input specification, when there is an open-circuit
between the input terminals, the data bits do not become 0. (They
become indeterminate between 1 and 250).
2. It is recommended that unused channels be shorted between the
input terminals.
NOTE
Digital Value
Current input line open
External power is OFF