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Signal Descriptions
Pin
1, 20, 4, 23, 7, 25, 9, 27
3, 22, 6
2, 21, 5, 24, 8, 26, 10, 28
NI 6520/6521 User Guide
P1.1COM
P1.3COM
P1.5COM
P1.7COM
NO CONNECT
Figure 5. NI 6520/6521 Pin Assignments
For more information on signals on the NI 6520/6521, refer to the Signal
Descriptions section.
Table 3. NI 6520/6521 Signal Descriptions
Signal Name
NO.<7..0>
Normally Open—These are the normally open
terminals of the relays.
NC.<2..0>
Normally Closed—These are the normally closed
terminals of the relays. This is the default state for
the Form C relays.
COM.<7..0>
Common—These are the common terminals of the
relays.
1
20
P1.1NO
2
21
3
P1.1NC
22
4
P1.3NO
23
5
24
6
P1.5NO
25
7
26
8
27
P1.7NO
9
28
10
29
11
P0.1+
30
12
P0.1–
31
13
P0.3+
32
14
P0.3–
33
15
P0.5+
34
16
P0.5–
35
17
P0.7+
36
18
P0.7–
37
19
Description
12
P1.0NO
P1.0COM
P1.0NC
P1.2NO
P1.2COM
P1.2NC
P1.4NO
P1.4COM
P1.6NO
P1.6COM
NO CONNECT
P0.0+
P0.0–
P0.2+
P0.2–
P0.4+
P0.4–
P0.6+
P0.6–
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