Rockwell Automation 2706 DL40 HARDWARE USER MANUAL - Manual (Page 87)

Thousands Digit Hundreds Digit Tens Digit Ones Digit
(0 – 9) (0 – 9) (0 – 9) (0 – 9)
Chapter 9
Using the Parallel Port
9 – 3
Table 9.C
Sample value obtained by summing the binary value of each data line’s logic level
Data Line Logic Level Value
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
Logic 1
Logic 0
Logic 0
Logic 0
Logic 1
Logic 0
Logic 0
Logic 1
Logic 0
Logic 0
Logic 0
Logic 0
Logic 0
Logic 0
Logic 0
Logic 0
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
1
0
0
0
16
0
0
128
0
0
0
0
0
0
0
0
Sum of all values 145
Adding the values of the individual data lines provides the value being
entered, 145.
The 16 data lines can also be used to input BCD data. The BCD numbering
system uses a group of four binary digits to represent a single decimal digit.
Table 9.D shows the value of each data line.
Table 9.D
BCD Value of Data Lines
Data Line D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Data Line Value 8000 4000 2000 1000 800 400 200 100 80 40 20 10 8 4 2 1
For example, assume the following logic levels appear as shown in
Table 9.E.
Using BCD Data Input