The 1769-PB2 from Allen‑Bradley is a high-performance DC power supply designed specifically for CompactLogix I/O systems. This module converts a nominal 24V DC input into stable 5V and 24V DC outputs for powering connected controllers and I/O modules. It delivers 2.0A at 5V DC and 0.8A at 24V DC, ensuring reliable operation of your automation components. Furthermore, the 1769-PB2 supports bidirectional power distribution, allowing you to install up to eight modules on each side for a total of 16 modules. Its compact form factor and DIN-rail mounting capability make it a practical choice for space-constrained panels. Additionally, this unit carries c-UL-us, CE, and C-Tick certifications, meeting global industrial standards.
The 1769-PB2 operates on a DC input voltage range of 19.2 to 31.2V DC, with a nominal rating of 24V DC. This wide range accommodates variations in battery-backed or rectified DC supplies commonly found in industrial environments. The module consumes approximately 50VA at 24V DC and dissipates 7.5W of heat at 60 °C. During startup, it can handle an inrush current of up to 30A at 31.2V DC, which is typical for capacitive loads. Therefore, you should size your upstream circuit breaker or fuse accordingly to prevent nuisance tripping.
This power supply provides 2.0A at 5V DC and 0.8A at 24V DC to the CompactLogix backplane. The 5V output supports the logic circuitry of I/O modules, while the 24V output powers field devices and output channels. Importantly, the total output current is shared across both sides of the power supply. Specifically, the 1769-PB2 can deliver 1A per side at 24V DC or 2A total at 5V DC. This balanced distribution ensures that modules on either side receive adequate power without overloading the supply.
The 1769-PB2 features a power supply distance rating of 8, which means you can connect eight (8) 1769-series I/O modules on each side of the power supply. Consequently, a single power supply can support up to 16 modules in total. This rating counts modules in both directions, giving you excellent flexibility when laying out your control system. For example, you might place the processor on one side and analog or specialty modules on the other side to optimize wiring and signal integrity.
An internal fuse protects the 1769-PB2 against overcurrent and short-circuit conditions. Compatible replacement fuses include the Littelfuse 02153.15MXP and the Wickmann 19195-3.15A. This built-in protection mechanism safeguards both the power supply and the connected I/O modules from damage due to abnormal line transients. Additionally, the module has a continuous isolation voltage rating of 75V, providing a safety barrier between the input and output circuits.
The 1769-PB2 measures approximately 118 mm x 70 mm x 87 mm (4.65 x 2.76 x 3.43 inches), with the height increasing to 138 mm (5.43 inches) when including the mounting tabs. Weighing only 485 g (1.07 lb) , it is slightly lighter than its AC counterpart. The shipping weight is about 2 pounds, which minimizes freight costs for bulk orders. Its compact footprint allows for efficient use of panel space, especially in cabinets with multiple power supplies.
The 1769-PB2 has an open-style enclosure, meaning it does not have its own protective housing. Therefore, you must install it inside a control cabinet that provides adequate protection against dust, moisture, and corrosive contaminants. The module requires a minimum clearance of 50 mm (2 inches) from adjacent equipment to ensure proper airflow and heat dissipation. Its operating temperature range is 0 to 60 °C (32 to 140 °F) , while storage temperatures can span from -40 to 85 °C (-40 to 185 °F). Moreover, the unit handles non-condensing relative humidity from 5% to 95%, making it suitable for most indoor industrial settings. It also withstands operating vibration of 5G at 10 to 500 Hz and operating shock of 30G, ensuring durability in demanding environments.
Mounting the 1769-PB2 is straightforward using either a standard DIN rail or a direct panel mount. Begin by securing the module in your chosen location, ensuring the 50 mm clearance is maintained. Next, connect the 24V DC input wiring using 14 AWG (2.5 mm²) solid copper wire rated for 90 °C or higher. Keep the wire leads short to reduce voltage drops and electromagnetic noise. The terminal block is clearly marked for polarity, so verify the connections before applying power. Additionally, connect the ground terminal to a reliable earth ground using the same gauge wire. Once wiring is complete, attach the I/O modules on both sides, respecting the distance rating. Finally, power up the system and verify that the status indicators illuminate correctly.
One (1) Allen-Bradley 1769-PB2 DC Power Supply module
One (1) removable terminal block for DC input connections
DIN-rail mounting clip (pre-installed)
Installation instruction sheet
Note: DC power cables, fuses, and additional mounting hardware are sold separately.
All orders are shipped via FedEx, UPS, or DHL with complete tracking services. Each unit is carefully packed in anti-static packaging to prevent electrostatic discharge damage during transit. Orders typically process within 1-2 business days. Expedited shipping options are available upon request for time-sensitive projects.
1. What is the input voltage range for the 1769-PB2?
The 1769-PB2 accepts a DC input range of 19.2 to 31.2V DC, with a nominal rating of 24V DC. This accommodates most industrial DC supply systems.
2. How many I/O modules can I connect to this power supply?
You can connect up to eight (8) modules on each side, for a total of 16 modules. This is based on the power supply distance rating of 8.
3. Does the 1769-PB2 have a replaceable fuse?
Yes, it contains an internal fuse. Compatible replacements include the Littelfuse 02153.15MXP and Wickmann 19195-3.15A fuses.
4. Can I mount this power supply on a DIN rail?
Absolutely. The 1769-PB2 comes with a pre-attached DIN-rail clip for quick and secure installation in standard industrial cabinets.
5. What is the power dissipation of this module?
The 1769-PB2 dissipates approximately 7.5W at 60 °C. This value is important for calculating the heat load inside your enclosure and sizing cooling equipment accordingly.
| Brand Name | |
| Model No. | 1769-PB2 |
| Product Type | I/O Power Supply |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
