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1769-PB2

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The Allen Bradley 1769-PB2 Compact I/O Expansion Power Supply is a robust and reliable module designed to provide supplemental power to CompactLogix and MicroLogix 1500 controller expansion banks.
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Technical specifications for 1769-PB2

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1769-PB2
  • Product Family:
    CompactLogix
  • Product Type:
    Compact I/O Expansion Power Supply
  • Stock:
    1
  • Input voltage range:
    19.2…31.2V DC
  • Current capacity @ 5V DC:
    2.0 A
  • Current capacity @ 24V DC:
    0.8 A
  • Continuous Isolation Voltage:
    75V with reinforced insulation
  • Weight:
    0.36 kg
  • Estimated shipping dimensions:
    7.2x8.5x13cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Use Cases Operating Environment Monitoring & Control

Features:

  • Power Expansion for 1769 Compact I/O System Backplanes
  • Delivers Regulated Dual DC Voltage Output Across Left and Right Bus Directions
  • Integrates with CompactLogix Controllers and 1769 Expansion I/O Modules
The Allen Bradley 1769-PB2 Compact I/O Expansion Power Supply operates as a dedicated DC expansion power unit within a 1769 Compact I/O system, providing regulated power directly to connected modules across the system backplane. It converts an incoming DC input voltage range of 19.2 to 31.2 V DC into standard system bus power, distributing up to 2 A at 5V DC and 1 A at 24V DC in both directions. Designed with a Reinforced Insulation Type structure, the module features a continuous isolation voltage of 75V and undergoes factory routine testing at 1697V DC for 1 second between the DC input and the system backplane, ensuring stable operational safety for adjacent controller and I/O hardware.

The 1769-PB2 provides essential system bus current required when expanding I/O banks beyond the current capacity of the primary controller supply, directly supporting proper operation of high-density I/O configurations. To maintain safe bus distribution, the module has a power supply distance rating of 8, meaning a maximum of 8 I/O modules can be installed on either side of the supply. The unit is designed for panel or DIN rail mounting within the Compact I/O structure, serving as an intermediate power node in multi-bus system layouts.

For system configurations requiring extended I/O capacity, the 1769-PB2 enables additional module expansion by supplementing backplane current where total system draw exceeds primary limits. When integrated into an expanded Compact I/O rack, the supply powers adjacent digital, analog, or specialty I/O modules up to its maximum current limits (2 A @ 5V DC / 1 A @ 24V DC). System integrators must perform a complete backplane load calculation across both voltage buses to ensure the connected modules stay within these specified electrical parameters and maintain proper Class 1 protective earth grounding for safety compliance.

The 1769-PB2 Allen Bradley Compact I/O Expansion Power Supply may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen Bradley 1769-PB2 Compact I/O Expansion Power Supply Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen Bradley 1769-PB2 Compact I/O Expansion Power Supply Specs

General

  • Manufacturer Bently Nevada
  • Model 1769-PB2
  • Condition New Original ready stock
  • Product Family 1769-PB2K,1769-PB4,1769-PA2
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Distributed I/O Banks: Powers secondary and tertiary Compact I/O banks when branching out from a central controller using expansion cables.
  • CompactLogix Systems: Supplements CompactLogix 1769 controllers (like the 1769-L32E or 1769-L35E) when the system’s total module power consumption exceeds the processor's built-in power capacity.
  • MicroLogix 1500 Expansion: Provides backplane power for specialized, high-density, or isolated 1769 expansion modules connected to a MicroLogix 1500 base assembly.
  • Network Adapter Assemblies: Acts as the local power source for distributed I/O chassis utilizing 1769-AENTR Ethernet or 1769-ADN DeviceNet adapters.
  • Input Voltage Range: Operational between 19.2V DC and 31.2V DC (24V DC nominal input).
  • Operating Temperature: Safe for operation between 0 °C and 60 °C (32 °F to 140 °F).
  • Relative Humidity: Built for non-condensing industrial environments with up to 95% relative humidity.
  • Atmospheric Environment: Intended for clean, dry locations classified under Pollution Degree 2 and Overvoltage Category II limits.
  • Hazardous Area Approvals: Standard versions are UL-listed for use in Class I, Division 2 (Groups A, B, C, D) hazardous industrial sites.
  • Distance Rating Control: Enforces a hardware restriction where modules must be placed within a maximum of 8 slots from either side of the power supply.
  • LED Status Indicator: Features a front-facing diagnostic LED indicator that glows green during standard healthy operations to confirm proper voltage output.
  • Internal Protection Control: Equipped with built-in, non-user-replaceable fuse overcurrent protection to prevent catastrophic backplane or module damage during an electrical short.
  • Bus Lock Lever: Integrates a mechanical bus connector lock lever to ensure solid communication and grounding connectivity across the tongue-and-groove system backplane.
Description
The Allen-Bradley 1769-PB2 Compact I/O Expansion Power Supply is engineered to address backplane power degradation and electrical noise propagation in expanding industrial automation banks, solving the problem of system instability and unexpected logic resets caused by insufficient power across multi-module configurations. Designed as a dedicated DC expansion unit, the 1769-PB2 supplies a maximum backplane current capacity of 2 A at 5V DC and 1 A at 24V DC across both left and right directions, providing reliable energy distribution to adjacent I/O modules. To safeguard sensitive controller logic from field disturbances, the 1769-PB2 features a 75V continuous isolation rating supported by a Reinforced Insulation Type design, and it undergoes rigorous routine testing at 1697V DC for 1 second between the DC power input and the system.

In practical application scenarios, the 1769-PB2 power supply is utilized when an automated control panel requires high-density expansion beyond the power delivery capabilities of the primary controller supply. For example, in automated packaging machinery, high-speed material handling systems, water/wastewater treatment facilities, and automotive assembly lines, control architectures often need dozens of digital, analog, and specialty modules within a single system bank. In these demanding environments, inserting a 1769-PB2 unit prevents field-side electrical interference from reaching the system backplane while supplying clean, regulated voltage to distant I/O points.

For installation and system integration, the 1769-PB2 module mounts on a standard DIN rail or direct panel surface within the 1769 Compact I/O architecture. The 1769-PB2 carries a power supply distance rating of 8, meaning it can power up to 8 I/O modules positioned on either side of the power unit (up to 16 modules total per power expansion stage, subject to current draw calculations). System integrators must connect a compatible 24V DC input source (operating from 19.2V DC to 31.2V DC) and ensure proper Class 1 protective earth grounding to maintain the full 75V continuous reinforced isolation threshold.
Revisions

Revision Part #

Also known as

1769-PB2 Ser A
1769-PB2/A, Series A, Rev A
Alternative Names
1769-P82 1769P82 1769PB2 I769-P82 I769-PB2 I769P82 1769-PA2 1769-PA2K 1769-PB2K 1769-PA4 1769-PA4K 1769-PB4 1769-PB4K
Technical notes
Allen Bradley 1769-PB2 CompactLogix | RS Logix 5000| 24 VDC Input 2 Amp with 5 VDC Output Power Supply Module. , 8 modules, Open enclosure.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why is the 1769-PB2 needed?
It supplies extra backplane power when additional I/O modules exceed the controller's power capacity, helping maintain stable system performance.
What problems does the 1769-PB2 solve?
It prevents voltage drops, communication errors, and unstable I/O operation caused by insufficient backplane power.
Where is the 1769-PB2 commonly used?
It is widely used in water treatment, automotive manufacturing, material handling, and other industrial automation systems.
When should another 1769-PB2 be added?
An additional unit is recommended when expanding a Compact I/O system with more digital, analog, or specialty modules.

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