Configured for power distribution in CompactLogix controller systems, the Allen-Bradley 1769-PB4 (1769-PB4 DC Power Supply) provides stable electrical conversion from DC input sources to localized 24 VDC output rails. The hardware functions as an integrated power component, maintaining logic power across the I/O backplane to facilitate deterministic control execution.

Hardware Specifications

Deterministic Network and I/O Density Scaling

The 1769-PB4 is engineered to support the rigorous demands of CompactLogix controller platforms, ensuring that backplane bus communication velocity remains stable under varying load conditions. The module design supports I/O density scaling by providing consistent power levels across the backplane, which minimizes signal noise and prevents voltage drops that could otherwise interfere with EtherNet/IP deterministic networks. Furthermore, the firmware flash compatibility of the broader CompactLogix system relies on the stable power environment provided by the 1769-PB4 to execute critical control updates and logic processing without interruption.

Field Installation Guidelines

• Mounting: Secure the power supply to the CompactLogix rail using the provided latching mechanism; ensure proper spacing for heat dissipation.

• Grounding: Connect the chassis ground terminal to a low-impedance earth ground to minimize electromagnetic interference and ensure operator safety.

• Wiring: Use wire gauges appropriate for the input current; ensure all power connections are torqued to manufacturer specifications.

• Environment: Install in an enclosure that protects against environmental contaminants, as the module requires adequate airflow to maintain the rated power dissipation.

Ordering Info

• Package includes: One (1) 1769-PB4 Power Supply module.

• Note: Verify that the total system power requirement does not exceed the capacity of this unit.

• Documentation: Installation instructions are included.

Frequently Asked Questions

Q: Can the 1769-PB4 be used to power a redundant power supply configuration?

A: Redundant configurations require specific system design considerations; consult the CompactLogix installation manual to verify if your specific controller supports power supply redundancy using the 1769-PB4.

Q: Is this power supply capable of hot-swapping?

A: The 1769-PB4 is not designed for hot-swapping; the system must be de-energized before removing or installing the power supply module.

Q: What is the purpose of the distance rating?

A: The distance rating indicates how many modules away from the power supply an I/O module can be placed; exceeding this limit can result in excessive voltage drop across the backplane.