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