National Instruments CFP-RLY-421 User Manual

323617A-01 May 2003© 2003 National Instruments Corp. All rights reserved.FieldPoint™, National Instruments™, NI™, and ni.com™ are trademarks of Natio

cFP-RLY-421 10 ni.com•Do not share the external supply voltages (the V and C terminals) with other devices (including other FieldPoint devices), unles

© National Instruments Corp. 11 cFP-RLY-421SpecificationsThe following specifications are typical for a range of –40 to 60 °C unless otherwise noted.R

cFP-RLY-421 12 ni.comPhysicalIndicators ... Green POWER and READY indicators, 8 green output state indicatorsWe

© National Instruments Corp. 13 cFP-RLY-421SafetyThis product is designed to meet the requirements of the following standards of safety for electrical

cFP-RLY-421 14 ni.comWhere to Go for SupportFor more information about setting up the FieldPoint system, refer to these National Instruments documents

cFP-RLY-421 2 ni.comBefore you configure a FieldPoint system that uses a cFP-RLY-421 module, calculate the total power consumption of the I/O modules

© National Instruments Corp. 3 cFP-RLY-421Figure 1. Installing the cFP-RLY-421Wiring the cFP-RLY-421The cFP-CB-x connector block has connections for

cFP-RLY-421 4 ni.comTable 1 lists the terminal assignments for the signals of each channel.All of the COM terminals are connected internally and all o

© National Instruments Corp. 5 cFP-RLY-421Connecting Loads to the cFP-RLY-421Wire an external power supply to the load and IC terminal of the individu

cFP-RLY-421 6 ni.comIn addition, the cFP-RLY-421 has internal protection MOVs to prevent excessively high voltage from being applied across the contac

© National Instruments Corp. 7 cFP-RLY-421Diode Circuit CR Circuits Varistor Circuit Diagram NotesUse in DC applications only.Compared to RC type, cir

cFP-RLY-421 8 ni.comIn-Rush CurrentThe type of load and its in-rush current characteristics, together with switching frequency, can cause contact weld

© National Instruments Corp. 9 cFP-RLY-421Upgrading the FieldPoint FirmwareYou may need to upgrade the FieldPoint firmware when you add new I/O module