Installation Instructions · Publication 1734-IN058 · Rockwell Automation

1734-EP24DC POINT I/O 24V DC Expansion Power Supply Install Guide

This document is the installation instructions for the Allen-Bradley POINT I/O 1734-EP24DC and 1734-EP24DCK 24V DC expansion power supplies, series B. It covers installation, removal, replacement, wiring, status indicators, and electrical specifications for the expansion power supply. The supply extends backplane bus power for up to 17 I/O modules and provides field power partitioning in a POINT I/O system. Conformal coated catalog numbers carry the suffix K and share identical specifications.

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4…17 modules I/O Module Capacity
10…28.8V DC Input Voltage Range
10 A Field Power Bus Current, Max
-20…+55 Operating Temperature

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Specifications

Power Supply Specifications

I/O module capacity 4…17 modules, depending on current rating of each module
Input voltage rating 24V DC nominal; 10…28.8V DC range
Field side power requirements 24V DC (+20% = 28.8V DC max) @ 400 mA max
Inrush current, max 6 A for 10 ms
POINTBus output current (horizontal) 1 A @ 10…19.2V input; 1.3 A @ 19.2…28.8V input
POINTBus output current (vertical) 1 A @ 10…28.8V input
Input overvoltage protection Reverse polarity protected
Interruption Output stays within specs when input drops out for 10 ms @ 10V with maximum load
Dimensions (H x W x D), approx 79.8 x 25.3 x 133.1 mm (3.14 x 1.0 x 5.24 in)
Weight, approx 120 g (4.3 oz)
Terminal base screw torque 0.6 N•m (7 lb•in)

General Specifications

Power consumption, max 9.8 W @ 28.8V DC
Power dissipation, max 3.0 W @ 28.8V DC
Thermal dissipation, max 10.0 BTU/hr @ 28.8V DC
Field power bus supply current, max 10 A
Isolation voltage 50V continuous, tested to withstand 2600V DC for 60 s
Enclosure type rating None (open-style)
North American temp code T4A
UKEX/ATEX temp code T4
IECEx temp code T4
Conductor size 0.324…2.08 mm2 (22…14 AWG) solid or stranded copper wire rated @ 75 °C (167 °F) or greater; 3/64 inch (1.2 mm) insulation maximum

Environmental Specifications

Temperature, operating -20…+55 °C (-4…+131 °F)
Temperature, storage -40…+85 °C (-40…+185 °F)
Relative humidity 5…95% noncondensing
Vibration 5 g @ 10…500 Hz (IEC 60068-2-6)
Shock, operating 30 g (IEC 60068-2-27)
Shock, nonoperating 50 g (IEC 60068-2-27)
ESD immunity 6 kV contact discharges; 8 kV air discharges (IEC 61000-4-2)
Radiated RF immunity 10 V/m with 1 kHz sine-wave 80% AM from 80…6000 MHz (IEC 61000-4-3)
EFT/B immunity ±2 kV at 5 kHz on power ports; ±2 kV at 5 kHz on signal ports (IEC 61000-4-4)
Surge transient immunity ±1 kV line-line (DM) and ±2 kV line-earth (CM) on signal ports (IEC 61000-4-5)
Conducted RF immunity 10 V rms with 1 kHz sine-wave 80% AM from 150 kHz to 80 MHz (IEC 61000-4-6)
Emissions IEC 61000-6-4

Catalog Number Format

How to read an Allen-Bradley 1734 catalog number. Each position encodes a specific configuration attribute.

Position
Meaning
Example
Base catalog number
24V DC expansion power supply for POINT I/O
1734-EP24DC
Suffix K
Conformal coated version; specifications identical to non-conformal coated
1734-EP24DCK

Certifications & Compliance

c-UL-us: UL Listed Industrial Control Equipment, certified for US and Canada. See UL File E65584. UL Listed for Class I Division 2 Group A,B,C,D Hazardous Locations, certified for U.S. and Canada. See UL File E194810. UK and CE: Compliant with UK Statutory Instrument 2016 No. 1091 and EU 2014/30/EU EMC Directive; EN 61326-1, EN 61000-6-2, EN 61000-6-4, EN 61131-2. RoHS: Compliant with UK Statutory Instrument 2012 No. 3032 and EU 2011/65/EU RoHS; EN IEC 63000. RCM: Compliant with Australian Radiocommunications Act; EN 61000-6-4. Ex (ATEX/UKEX): II 3 G Ex ec IIC T4 Gc; DEMKO 04 ATEX 0330347X; UL22UKEX2478X; EN IEC 60079-0; EN IEC 60079-7. KC: Korean Registration of Broadcasting and Communications Equipment; Article 58-2 of Radio Waves Act, Clause 3. IECEx: II 3 G Ex ec IIC T4 Gc; IECEx UL 20.0072X; IEC 60079-0; IEC 60079-7. Morocco: Arrêté ministériel n° 6404-15 du 29 ramadan 1436. CCC: CNCA-C23-01 CCC Implementation Rule Explosion-Proof Electrical Products; CCC: 2020122309111607.

Document Contents

Full PDF covers the following topics in detail:

  • Summary of Changes
  • About the Power Supply
  • Install the Power Supply
  • Remove the Power Supply
  • Replace the Power Supply
  • Wire the Power Supply
  • Interpret Status Indicators
  • Specifications
  • Additional Resources

Frequently Asked Questions

How many I/O modules can the 1734-EP24DC expansion power supply support?
The 1734-EP24DC expansion power supply extends the backplane bus power for up to 17 I/O modules to the right of the supply. It supports 4 to 17 modules depending on the current rating of each module. With any POINT I/O adapter, you can use multiple expansion power supplies to add modules in increments of 4 to 17, for a total of 63 I/O modules.
What is the input voltage range for the 1734-EP24DC?
The 1734-EP24DC accepts a nominal input of 24V DC with an operating range of 10 to 28.8V DC. Do not connect 120/240V AC power to this supply.
What adapters can the 1734-EP24DC and 1734-EP24DCK be used with?
The 1734-EP24DC and 1734-EP24DCK expansion power supplies must be used only with POINT I/O adapters, such as the 1734-ADN DeviceNet adapter (adapter class products).
What is the difference between the 1734-EP24DC and 1734-EP24DCK?
Catalog numbers with the suffix K, such as 1734-EP24DCK, are conformal coated versions of the standard 1734-EP24DC. Their specifications are identical to the non-conformal coated catalog numbers.
What does the 1734-EP24DC expansion power supply do for field power?
The expansion power supply passes 24V DC field power to I/O modules to the right of it and creates a new field voltage partition segment for driving field devices. It separates field power from I/O modules to its left, providing functional and logical partitioning to separate field power between input and output modules, analog and digital modules, or to group modules for a specific task.
What are the POINTBus output current ratings for horizontal versus vertical mounting?
For horizontal mounting, the POINTBus output current is 1 A at 10 to 19.2V input and 1.3 A at 19.2 to 28.8V input. For vertical mounting, the output current is 1 A across the full 10 to 28.8V input range.
What status indicators are on the 1734-EP24DC and what do they indicate?
The 1734-EP24DC has two status indicators: one green field power status indicator and one green 5V system power indicator. For either indicator, off means no power is applied to the device and steady green means the device is operating normally.

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