Allen-Bradley 1769-PB2 is a dedicated DC-input single-slot expansion power supply for 1769 CompactLogix L3x/L3y series PLC systems. Differing completely from AC-powered 1769-PA2/PA4 modules, it adopts pure 24VDC industrial DC power input, providing stable 5VDC backplane bus power and 24VDC auxiliary output. Optimized for DC-powered control cabinets and battery-backed automation systems, it is the ideal low-power, high-stability power supplementation solution for standard-density Compact I/O racks.

Core Technical Parameter Specifications

Module Type：1769 Compact I/O DC-input expansion power supply

DC Input Voltage Range：19.2–31.2VDC wide industrial adaptive voltage

Rated Input Voltage：24VDC standard industrial control power

Backplane Bus Output：5VDC / 2.0A stable rack bus power supply

Auxiliary Output：24VDC / 0.8A external auxiliary power output

Max Continuous Output Power：29W @ 60℃ full-temperature stable output

Max Inrush Current：25A instantaneous startup surge current tolerance

Insulation Grade：2596VDC 1s reinforced isolation withstand voltage

Protection Mechanism：Built-in overvoltage, undervoltage, overcurrent and short-circuit protection

Wiring Specification：22–14 AWG standard industrial copper wire

Mounting Method：Standard DIN rail and panel dual mounting

Operating Temperature：0℃ ~ +60℃ continuous industrial operation

Storage Temperature：-40℃ ~ +85℃ wide temperature storage range

Environmental Humidity：5%–95% non-condensing humidity adaptation

Certifications：UL, CSA, CE, Class I Div 2 hazardous location compliance

Pure DC Input Design & Stable Low-Power Supply Performance

The core feature of 1769-PB2 is its professional DC-only power supply architecture. Unlike PA-series AC power modules designed for mains grid input, PB2 is tailored for industrial 24VDC DC power environments, perfectly matching DC UPS backup systems, battery power supply and isolated DC power distribution cabinets. It avoids AC-DC conversion loss and grid frequency interference, delivering purer and more stable bus power for PLC and I/O modules.

With 2A 5VDC backplane current output, it effectively supplements insufficient CPU original power, supporting stable operation of conventional-density digital and analog I/O modules. The 0.8A 24VDC auxiliary output can supply power for on-site low-power sensors, indicator lights and small auxiliary circuits, reducing additional power adapter configuration. Multiple built-in protection functions comprehensively prevent module and rack equipment damage caused by voltage fluctuation, short circuit and overload faults.

DC Cabinet Adaptation & Plug-and-Play Retrofit Advantages

In fully DC-powered automation cabinets and equipment with UPS battery backup, AC power modules cannot be deployed, making 1769-PB2 the exclusive power expansion option. It adopts unified single-slot compact structure of 1769 series, with complete compatibility with all CompactLogix L2x/L3x controllers and Compact I/O racks, realizing seamless matching of DC system architecture.

It supports plug-and-play installation and replacement without program modification or cabinet reconstruction, suitable for incremental renovation of old DC control systems and standard equipment power expansion. Compared with high-power 1769-PB4, PB2 features lower power consumption and higher cost performance, perfectly meeting power supply demands of standard I/O quantity racks, avoiding performance redundancy and effectively reducing overall engineering costs.

Industrial Application Scenarios

AllenBradley 1769-PB2 is widely deployed in DC-powered industrial automation scenarios, including UPS-backed safety control systems, environmental protection monitoring equipment, intelligent logistics auxiliary racks, packaging machinery DC control cabinets and outdoor low-power automation devices.

North American standard DC equipment OEMs adopt PB2 for standardized DC power supply design to improve system stability. Latin American factory DC cabinet renovation projects deploy PB2 to solve insufficient backplane power. European low-power intelligent manufacturing equipment relies on its pure DC anti-interference performance to ensure long-term stable operation of control systems.