Technical FAQs

Ask a Question

External Fusing Change for 24vdc Momentum I/O Modules

Release Notice

The purpose of this Resolution is to inform users of 24vdc Momentum I/O Bases that the fusing requirement has changed.

Goals and Symptoms

Using a 315ma fast blow fuse on a redesigned 24vdc Momentum base may cause the fuse to blow when powered up. Since the 24vdc Momentum I/O bases have been redesigned to meet the new EMC and power hold-up requirements, it was necessary to increase the size of the external fusing.

Facts and Changes

The external fusing is indicated in the User Manuals as follows. It does not affect the recommended fusing for the I/O power.



Causes and Fixes

The recommended size of the external fuse for all Momentum I/O modules that are powered by 24 VDC, has changed from a 315ma Fast Blow fuse to a 1Amp Slow Blow fuse (Bussmann GDC-1A or equivalent).

The 1A Slow Blow fuse can be used on both new and old versions of 24vdc powered Momentum I/O bases listed below.

DC Discrete Modules

  • 170ADI34000 24V DC - 16 Pt Input Module Base
    170ADI34000C 24V DC - 16 Pt Input Module Base –Coated
    170ADI35000 24V DC - 32 Pt Input Module Base
    170ADI35000C 24V DC - 32 Pt Input Module Base -Coated
    170ADM35010 24V DC - 16 Pt Input/ 16 Pt Output Module Base
    170ADM35010C 24V DC - 16 Pt Input/ 16 Pt Output Module Base –Coated
    170ADM35011 24V DC - 16 Pt Input/ 16 Pt Output - Fast Response Module Base
    170ADM35015 24V DC - 16 Pt Input/ 16 Pt Output Module Base - True Low Signals
    170ADM39010 24V DC - 16 Pt Input/ 12 Pt Output - Monitored Module Base
    170ADM39030 24V DC - 10 Pt Input/ 8 Pt Relay Output Module Base
    170ADM39030C 24V DC - 10 Pt Input/ 8 Pt Relay Output Module Base –Coated
    170ADO34000 24V DC - 16 Pt Output Module Base
    170ADO34000C 24V DC - 16 Pt Output Module Base –Coated
    170ADO35000 24V DC - 32 Pt Output Module Base
    170ADO35000C 24V DC - 32 Pt Output Module Base –Coated
    170ADM85010 10 to 60 V DC - 16 Pt Input/ 16 Pt Output Module Base

Analog Modules
  • 170AAI03000 Analog - 8 Ch Differential Input Module Base
    170AAI03000C Analog - 8 Ch Differential Input Module Base –Coated
    170AAI14000 Analog - 16 Ch Single-Ended Input Module Base
    170AAI14000C Analog - 16 Ch Single-Ended Input Module Base –Coated
    170AAI52040 Analog - 4 Ch RTD, Thermocouple, and Mv Input Module Base
    170AAI52040C Analog - 4 Ch RTD, Thermocouple, and Mv Input Module Base –Coated
    170AAO12000 Analog - 4 Ch Output 0-20mA Module Base
    170AAO92100 Analog - 4 Ch Output 4-20mA Module Base
    170AAO92100C Analog - 4 Ch Output 4-20mA Module Base –Coated
    170AMM09000 Analog - 4 Ch In/ 2 Ch Out Module Base, w/ 24V DC 4 In/2 Out Digital
    170AMM09000C Analog - 4 Ch In/ 2 Ch Out Module Base, w/ 24V DC 4 In/2 Out Digital –Coated
    170AMM09001 Analog - 4 Ch In/ 2 Ch Out Module Base, w/ 12V DC 4 In/2 Out Digital

Specialty Modules
  • 170AEC92000 High Speed Counter Module Base


Also reference DMDI 1809.
Was this helpful?
What can we do to improve the information ?