Interfacing Inputs as a Group Example
MDrive23 Motion Control
+5VDC
PIN 1
Sample Software Configuration
'set inputs to user inputs active low, S1=0,0
S2=0,0
S3=0,0
S4=0,0
PR IN 'Read BCD State of Input Group
Figure 2.6: TTL Interface to Input Group
Truth Table - I/O Used as a Group
DEC | IO4 | IO3 | IO2 | IO1 |
0 | 0 | 0 | 0 | 0 |
1 | 0 | 0 | 0 | 1 |
2 | 0 | 0 | 1 | 0 |
3 | 0 | 0 | 1 | 1 |
4 | 0 | 1 | 0 | 0 |
5 | 0 | 1 | 0 | 1 |
6 | 0 | 1 | 1 | 0 |
7 | 0 | 1 | 1 | 1 |
8 | 1 | 0 | 0 | 0 |
9 | 1 | 0 | 0 | 1 |
10 | 1 | 0 | 1 | 0 |
11 | 1 | 0 | 1 | 1 |
12 | 1 | 1 | 0 | 0 |
13 | 1 | 1 | 0 | 1 |
14 | 1 | 1 | 1 | 0 |
15 | 1 | 1 | 1 | 1 |
Table 2.4: I/O Group Truth Table
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