National Instruments CFP-RLY-421 用户手册

© National Instruments Corp.

Figure 1.  Installing 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.

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).

1

cFP I/O Module

2

Captive Screws

3

cFP Controller Module

4

Screw Holes

5

cFP Backplane

4

4

3

2

1

5

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