©
National Instruments Corp.
3
cFP-RLY-421
Wiring the cFP-RLY-421
The cFP-CB-
x
connector block has connections for each of the
eight cFP-RLY-421 relay channels and for an external supply to
power field devices. If you are using the cFP-RLY-421 in a
hazardous voltage
application, you must use the cFP-CB-1
connector block or a suitable hazardous voltage cable. A hazardous
voltage is a voltage greater than 42.4 V
peak
or 60 VDC.
Caution
Ensure that hazardous voltage wiring is
performed only by qualified personnel adhering to local
electrical standards.
Each relay channel of the cFP-RLY-421 has two terminals:
one NO (normally open) and one IC (isolated common).
Table 1 lists the terminal assignments for the signals of each
channel.
All of the COM terminals are connected internally and all of the
V
SUP
terminals are connected internally. NI does not recommend
using the V
SUP
and COM terminals with the cFP-RLY-421.
Table 1.
Terminal Assignments
Channel
Terminal Numbers
NO
IC
0
1
2
1
3
4
2
5
6
3
7
8
4
9
10
5
11
12
6
13
14
7
15
16
cFP-RLY-421.new.fm Page 3 Tuesday, October 11, 2005 11:50 AM
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com