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Specifications
Connection Example 2
(Digital Switches)
-
8
+
Switch no.
8
Point Number
15
14
word n
Switch no. 4
0
1
word n + 1
Switch no. 8
word n + 1
1
0
be avoided, use shielded cables when wiring the DC Input Unit. Be
sure to keep the total length of the wires less than 10 m.
This example shows how the ID212 DC Input Unit can be wired using digital
switches. Just as the keys on the keyboard can access different combina-
tions of words and bits, the digital switches can access different combinations
of words and bits. For example, the combination of switch no. 1 and point 00
access word bit 00, word n.
However, for the sake of simplicity the figure below shows the digital switches
wired to control 32 bits instead of 64 bits as was shown in Example 1. Wire
STB 4, STB 5, STB 6, and STB 7 to access an additional 32 bits.
-
-
-
7
6
5
+
+
+
7
6
5
The table below shows the combinations made possible when the digital
switches are wired as shown in the figure above.
13
12
11
10
09
Switch no. 3
0
0
0
0
STB 1
Switch no. 7
0
0
0
1
STB 3
-
-
-
4
3
2
+
+
+
4
3
2
08
07
06
05
Switch no. 2
1
1
0
0
1
Switch no. 6
1
1
1
0
1
Appendix B
0
DATA 0
1
DATA 1
2
DATA 2
3
DATA 3
4
DATA 4
5
DATA 5
6
DATA 6
7
DATA 7
COM (+24)
8
9
STB 0
10
STB 1
11
STB 2
12
STB 3
13
STB 4
14
STB 5
15
STB 6
16
STB 7
+
17
COM (0 V)
24 VDC
18
+24 VDC
19
NC
D C B A COM
-
1
+
1
04
03
02
01
Switch no. 1
0
0
0
1
STB 0
Switch no. 5
0
1
0
0
STB 2
00
1
1
67
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