©
National Instruments Corp.
3
FP-RLY-420
Field Wiring
The terminal base has connections for each of the eight relay
channels and an external supply to power field devices. Each relay
channel of the FP-RLY-420 has two terminals: N.O. (Normally
Open) and I.C. (Isolated Common). The external supply is not
needed for the internal operation of the FP-RLY-420; however,
you may connect an external supply to power field devices by
connecting to the V and C terminals of the terminal base. If you
connect an external supply to the V and C terminals, the total
current supplied cannot exceed 6 A.
Table 1 lists the terminal assignments for the signals of each
channel.
Table 1.
Terminal Assignments
Chan-
nel
Terminal Numbers
N.O.
I.C.
V
sup
COM
0
1
2
17
18
1
3
4
19
20
2
5
6
21
22
3
7
8
23
24
4
9
10
25
26
5
11
12
27
28
6
13
14
29
30
7
15
16
31
32
