Modular Systems > National Instruments > Compact FieldPoint

cFP-RLY-421
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cFP-RLY-421, 8 Input Channel, Relay Output Module for Compact FieldPoint

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National Instruments cFP-RLY-421 Relay Output Module for Compact FieldPoint

The NI cFP-RLY-421 (Part Number: 777318-421) has eight SPST electromechanical relays. This Relay Output Module is designed to be mounted on a cFP-BP-x Compact FieldPoint backplane, which delivers operational power to the module. The cFP-CB-x Connector Block has connections for the eight relay channels on the cFP-RLY-421 module, as well as for an external supply to power field instruments. If this Relay Output Module is being utilized for hazardous voltage application, then they must use the cFP-CB-1 Connector Block or an appropriate hazardous voltage cable. A hazardous voltage is considered to be greater than 42.4 Vpeak or 60 VDC. The device is equipped with a SPST, non-latching, and normally open (NO) relay type; with a relay operate time of 8 ms. Another feature is a relay release and release bounce time of 4 ms.

Every relay channel of the NI cFP-RLY-421 has two terminals: one NO (normally open) and one IC (isolated common). All of the COM terminals are linked internally and all of the VSUP terminals are also linked internally. However, National Instruments does not suggest utilizing the COM and VSUP terminals with the cFP-RLY-421 Relay Output Module. An important fact to remember is that cascading power between two modules defeats isolation between those modules. Also, cascading power from the network module defeats all isolation between modules in the FieldPoint bank. The device has a recommended operating temperature of – 40 to 55 °C. It has a maximum AC switching power of 375 VA, and a maximum DC switching power of 60 W.

To link loads to the National Instruments cFP-RLY-421 Relay Output Module, the user must wire an external power supply to the load and the IC terminal of the separate channel. The user can install a 1.5 A, 250 V maximum, quick-acting fuse appropriate for the load at the IC terminal to protect the module and the load from harm. The device has a weight of 4.8 oz., with the dimensions: 4.3 x 4.3 x 3.6 in. It has an expected mechanical life of 2 × 107 operations minimum, an expected electrical life of 100,000 operations. As the cFP-RLY-421 is a UL recognized component, the system must be installed in a NEMA, IP, or UL listed enclosure to ensure safe use.

ModelcFP-RLY-421
ManufacturerNational Instruments
Part Number777318-421
TypeRelay Output Module for Compact FieldPoint
Channels8
Relay TypeSPST, nonlatching, normally open
Relay Operate Time8 ms
Dimensions4.3 by 4.3 by 3.6 in.
Weight4.8 oz.
Warranty2-3 Year Warranty
cFP-RLY-421 ManualUser Manual and Maintenance Manual Available for Download
PriceContact a sales representative for a quote.

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National Instruments cFP-RLY-421 Frequently Asked Questions

 

Question: What is the relay release time for the cFP-RLY-421 module?

 

Answer: The relay release time of the cFP-RLY-421 module is 4 ms.

 

Question: What is the maximum switching frequency of the NI cFP-RLY-421?

 

Answer: The maximum switching frequency of the NI cFP-RLY-421 is 20 operations per second.

 

Question: What do the LED indicators on the cFP-RLY-421 show?

 

Answer: The Power (green) LED indicator on the cFP-RLY-421 shows when power is on and the self-test has been passed. The Ready (green) LED indicator shows when the module is configured and ready.

 

Question: What is the operating temperature range of the NI cFP-RLY-421?

 

Answer: The operating temperature range of the NI cFP-RLY-421 is -40 to 55 °C.

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Common Typos:

CDP-RLY-421, CFP-DLY-421, CFP-FLY-421, CFP-RLU-421, CFP-RLY-R21
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