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For more information on signals on the NI 6520/6521, refer to the Signal
Descriptions section.
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
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P1.1NO
P1.1COM
P1.1NC
P1.3NO
P1.3COM
P1.5NO
P1.5COM
P1.7NO
P1.7COM
NO CONNECT
P0.1+
P0.1–
P0.3+
P0.3–
P0.5+
P0.5–
P0.7+
P0.7–
Figure 5. NI 6520/6521 Pin Assignments
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.
12
1
P1.0NO
20
2
P1.0COM
21
3
P1.0NC
22
4
P1.2NO
23
5
P1.2COM
24
6
P1.2NC
25
7
P1.4NO
26
8
P1.4COM
27
9
P1.6NO
28
10
P1.6COM
29
11
NO CONNECT
30
12
P0.0+
31
13
P0.0–
32
14
P0.2+
33
15
P0.2–
34
16
P0.4+
35
17
P0.4–
36
18
P0.6+
37
19
P0.6–
Description
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