Allen-Bradley 1769-PB4 CompactLogix Power Supply Module
The Allen-Bradley 1769-PB4, also cataloged as the 1769-PB4 DC Power Supply Module, operates as a dedicated hardware component for internal system bus power distribution within Allen-Bradley CompactLogix platforms.
Suffix Breakdown & Model Matrix
- 1769: Compact I/O hardware platform designation for Allen-Bradley CompactLogix systems.
- PB: Direct current (DC) power supply hardware classification code.
- 4: Power output capacity designation variant within the 1769 hardware family.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-PB4 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.45 kg (1.00 lbs) |
| Dimensions | Standard 1769 Compact I/O power supply width |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 14.5 W output capacity |
| Input Voltage | 19.2 to 31.2 VDC |
| Output Voltage | 5 VDC and 24 VDC backplane supply |
| Maximum Bus Current | 4.0 A at 5 VDC, 2.0 A at 24 VDC |
| System Compatibility | Allen-Bradley CompactLogix 1769 I/O banks |
Backplane Bus Communication and Deterministic I/O
The Allen-Bradley 1769-PB4 supply delivers regulated system power across high-speed backplane bus communication velocity pathways to drive CompactLogix processors and adjacent I/O cards. Operating reliably across EtherNet/IP deterministic networks, the module provides stable voltage conversion and thermal dissipation control to sustain continuous I/O density scaling. Integrated firmware flash compatibility and power distribution monitoring prevent logic resets during heavy field wiring inductive load switching across localized control racks.
Frequently Asked Questions
Q: How many I/O modules can the 1769-PB4 power supply drive on a single CompactLogix expansion bank?
A: The module can power local I/O modules up to its current limits (4.0 A at 5 VDC and 2.0 A at 24 VDC) within its maximum power supply distance rating limits.
Q: Does the 1769-PB4 support reverse polarity protection on its DC input terminals?
A: Yes, the unit incorporates built-in input surge suppression and reverse polarity defense circuits to prevent internal component damage during field wiring installation.
Field Installation Guidelines
- Shut off all primary 24 VDC external power sources before connecting field wiring to the 1769-PB4 input terminal strip.
- Mount the power supply securely on the DIN rail adjacent to the CompactLogix controller or local expansion rack bank.
- Wire the 19.2-31.2 VDC power lines using appropriate gauge copper conductors, securing terminal screws to specified torque limits.
- Connect the protective earth (PE) terminal directly to the enclosure ground bus bar using a short, low-impedance grounding wire.
- Lock the adjacent module bus connectors together to maintain reliable backplane voltage conductivity and mechanical stability.
Allen-Bradley 1769-PB4 CompactLogix Power Supply Module
Allen-Bradley 1769-PB4 CompactLogix Power Supply Module
The Allen-Bradley 1769-PB4, also cataloged as the 1769-PB4 DC Power Supply Module, operates as a dedicated hardware component for internal system bus power distribution within Allen-Bradley CompactLogix platforms.
Suffix Breakdown & Model Matrix
- 1769: Compact I/O hardware platform designation for Allen-Bradley CompactLogix systems.
- PB: Direct current (DC) power supply hardware classification code.
- 4: Power output capacity designation variant within the 1769 hardware family.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-PB4 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.45 kg (1.00 lbs) |
| Dimensions | Standard 1769 Compact I/O power supply width |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 14.5 W output capacity |
| Input Voltage | 19.2 to 31.2 VDC |
| Output Voltage | 5 VDC and 24 VDC backplane supply |
| Maximum Bus Current | 4.0 A at 5 VDC, 2.0 A at 24 VDC |
| System Compatibility | Allen-Bradley CompactLogix 1769 I/O banks |
Backplane Bus Communication and Deterministic I/O
The Allen-Bradley 1769-PB4 supply delivers regulated system power across high-speed backplane bus communication velocity pathways to drive CompactLogix processors and adjacent I/O cards. Operating reliably across EtherNet/IP deterministic networks, the module provides stable voltage conversion and thermal dissipation control to sustain continuous I/O density scaling. Integrated firmware flash compatibility and power distribution monitoring prevent logic resets during heavy field wiring inductive load switching across localized control racks.
Frequently Asked Questions
Q: How many I/O modules can the 1769-PB4 power supply drive on a single CompactLogix expansion bank?
A: The module can power local I/O modules up to its current limits (4.0 A at 5 VDC and 2.0 A at 24 VDC) within its maximum power supply distance rating limits.
Q: Does the 1769-PB4 support reverse polarity protection on its DC input terminals?
A: Yes, the unit incorporates built-in input surge suppression and reverse polarity defense circuits to prevent internal component damage during field wiring installation.
Field Installation Guidelines
- Shut off all primary 24 VDC external power sources before connecting field wiring to the 1769-PB4 input terminal strip.
- Mount the power supply securely on the DIN rail adjacent to the CompactLogix controller or local expansion rack bank.
- Wire the 19.2-31.2 VDC power lines using appropriate gauge copper conductors, securing terminal screws to specified torque limits.
- Connect the protective earth (PE) terminal directly to the enclosure ground bus bar using a short, low-impedance grounding wire.
- Lock the adjacent module bus connectors together to maintain reliable backplane voltage conductivity and mechanical stability.
