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© 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