Allen-Bradley 1768-PB3 – CompactLogix Power Supply | 1768 Series Platform
Engineering Background
The Allen-Bradley 1768-PB3 is a dedicated DC power supply module engineered for the CompactLogix 1768 Series control platform. Designed by Rockwell Automation to deliver stable, regulated power to the 1768 backplane, this module is a critical infrastructure component in mid-range PLC architectures deployed across discrete manufacturing, process control, and motion coordination applications.
Product Positioning
The 1768-PB3 occupies the power supply slot of the 1768 local chassis, providing isolated 24VDC input power conversion to the internal backplane bus. It is the standard power supply choice for 1768-L43 and 1768-L45 CompactLogix controllers, ensuring deterministic power delivery to all installed I/O and communication modules without external power conditioning requirements.
Complete Technical Specifications
| Catalog Number | 1768-PB3 |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Series | CompactLogix 1768 |
| Module Type | DC Power Supply |
| Input Voltage | 18–32 VDC (24VDC nominal) |
| Input Current (max) | 3.0 A @ 24VDC |
| Backplane Power Output | 10 W (5VDC backplane bus) |
| Isolation | Optical isolation, input-to-backplane |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5–95% non-condensing |
| Vibration | 2g @ 10–500 Hz (IEC 68-2-6) |
| Shock | 30g operational, 50g non-operational |
| Enclosure Rating | Open type (panel/enclosure mount required) |
| Certifications | UL, CE, CSA, cUL |
| Dimensions (H×W×D) | Refer to Rockwell publication 1768-IN009 |
| Weight | Approx. 500 g |
| Compatible Controllers | 1768-L43, 1768-L45 |
| Compatible Chassis | 1768-A10 (10-slot local chassis) |
Proven Application Environments
- Automotive Assembly Lines — Powering CompactLogix controllers managing robotic welding cells and conveyor sequencing with 24VDC plant bus infrastructure.
- Food & Beverage Processing — Deployed in washdown-adjacent control panels where stable backplane power is critical for hygienic process interlocks.
- Oil & Gas Wellhead Control — Used in remote RTU panels with 24VDC battery-backed power systems requiring wide input voltage tolerance.
- Water/Wastewater SCADA — Integrated into distributed pump station panels running 1768-L43 controllers with EtherNet/IP SCADA connectivity.
- Pharmaceutical Batch Control — Supports 21 CFR Part 11-compliant systems where validated hardware configurations mandate OEM-specified power modules.
- Machine Tool & Motion Control — Paired with 1768-M04SE Sercos motion modules in coordinated multi-axis CNC and servo applications.
Engineering Advantages
- Wide Input Voltage Range (18–32 VDC) — Tolerates plant bus fluctuations and battery discharge curves without nuisance trips or controller faults.
- Optical Isolation — Eliminates ground loop interference between field-side 24VDC power and the sensitive 5VDC backplane logic bus.
- Hot-swap Compatible Design — Supports controlled power cycling procedures per Rockwell guidelines without full chassis de-energization in qualified maintenance scenarios.
- Compact Form Factor — Occupies a single slot in the 1768 chassis, maximizing available I/O density in space-constrained control panels.
- Diagnostic LED Indicators — Onboard PWR and FLT LEDs provide immediate visual status for commissioning and field troubleshooting without requiring software tools.
- Long-term Platform Availability — Rockwell Automation maintains active support for the 1768 platform; OEM replacement modules are available through authorized channels including Konmask.com.
System Architecture & Signal Flow
The 1768-PB3 installs in the dedicated power supply slot (leftmost position) of the 1768-A10 local chassis. The module accepts 24VDC from the plant power distribution panel via the two-position screw terminal block on the module face. Internally, the switching power supply converts and regulates this input to the 5VDC backplane bus voltage, which is distributed via the chassis backplane connector to all installed modules including the 1768-L43/L45 controller, 1768-ENBT EtherNet/IP bridge, and any installed 1769 Compact I/O adapter modules.
The backplane power budget of 10W must be verified against the aggregate current draw of all installed modules using Rockwell’s System Power Calculator (available in Studio 5000 or the online configurator) prior to system commissioning. Exceeding the power budget will result in module fault conditions and potential system instability.
Sourcing & Quality Verification
- OEM Traceability — All 1768-PB3 units sourced by Konmask.com are verified against Rockwell Automation’s catalog specifications. Catalog number, series letter, and firmware revision are confirmed prior to shipment.
- Counterfeit Mitigation — Units are inspected for authentic Rockwell labeling, holographic security features, and correct PCB markings. Suspected non-genuine units are quarantined and not sold.
- Functional Testing — Available upon request: pre-shipment power-on verification with documented test report confirming input voltage acceptance and backplane output within specification.
- Condition Options — New-in-box (NIB), factory-reconditioned, and tested-used grades available. Condition and warranty terms are explicitly stated on each order confirmation.
- Documentation Package — Rockwell Automation installation instructions (1768-IN009) and declaration of conformity available upon request.
Procurement Process
- Submit RFQ — Contact Konmask.com via the product page quote form, email support@konmask.com, or WhatsApp/phone +0086 19859288691 with your required quantity, condition preference, and delivery timeline.
- Receive Quotation — Our technical sales team will respond within 1 business day with pricing, lead time, and available stock confirmation.
- Order Confirmation — Purchase order accepted via email. Proforma invoice issued for prepayment or net terms (qualified accounts).
- Quality Inspection & Packing — Each unit undergoes pre-shipment inspection. Anti-static packaging with moisture barrier bag and desiccant used for all electronic modules.
- Shipment & Tracking — DHL Express, FedEx International Priority, or sea freight available. Tracking number provided within 24 hours of dispatch.
- After-sales Support — Technical support available for installation verification and compatibility questions post-delivery.
Technical FAQ
Q: Is the 1768-PB3 compatible with the 1769 CompactLogix platform?
A: No. The 1768-PB3 is exclusively designed for the 1768 chassis (1768-A10). The 1769 CompactLogix platform uses a different power supply architecture integrated into the controller module itself and does not use a separate power supply module.
Q: Can I use a 120/240VAC power source with the 1768-PB3?
A: No. The 1768-PB3 accepts only 18–32 VDC input. For AC-powered panels, an external 24VDC power supply (e.g., Allen-Bradley 1606 series) must be used upstream of the 1768-PB3.
Q: What does the FLT LED indicate?
A: A solid red FLT LED indicates the backplane power output is outside specification, typically caused by an overloaded backplane (total module current draw exceeding 10W) or an internal module fault. Verify the system power budget and remove modules one at a time to isolate the cause.
Q: Is a firmware update required after replacing the 1768-PB3?
A: No. The 1768-PB3 is a passive power supply module with no firmware. Replacement is a direct hardware swap; no software configuration changes are required in Studio 5000 or RSLogix 5000.
Q: What warranty does Konmask.com provide?
A: New-in-box units carry a 12-month warranty against manufacturing defects. Tested-used units carry a 90-day functional warranty. Full warranty terms are provided on the order confirmation.
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