Process & Discrete Automation Solution — Allen-Bradley 1756-PB72 | ControlLogix
The Allen-Bradley 1756-PB72 is a 24V DC input power supply module designed for the ControlLogix platform (1756 chassis). It delivers stable, high-efficiency DC power to ControlLogix I/O, communication, and controller modules, making it a cornerstone component in mission-critical industrial automation systems worldwide.
Where This Product Is Used
The 1756-PB72 is specified across a broad range of industries and application environments where reliable 24V DC bus power is essential:
- Oil & Gas: Pipeline SCADA systems, wellhead control panels, compressor station automation, and offshore platform DCS integration.
- Automotive Manufacturing: Body-in-white welding lines, paint shop conveyors, powertrain assembly, and end-of-line test stations.
- Food & Beverage: Filling and packaging lines, CIP (Clean-In-Place) control systems, and cold-chain conveyor automation.
- Water & Wastewater: Pump station control, SCADA-linked remote I/O panels, and chemical dosing systems.
- Pharmaceutical: Batch process control (ISA-88 compliant), cleanroom HVAC automation, and serialization line control.
- Power Generation & Utilities: Substation automation, turbine control auxiliary panels, and load management systems.
- Discrete Manufacturing: Machine tool control, robotic cell integration, and high-speed packaging machinery.
- Mining & Metals: Conveyor drive control, crusher automation, and smelter process management.
Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 1756-PB72 |
| Platform | ControlLogix (1756 Chassis) |
| Input Voltage | 18–32V DC (nominal 24V DC) |
| Output Power | 72W |
| Backplane Current (1.2V) | 2A |
| Backplane Current (3.3V) | 3A |
| Backplane Current (5V) | 4A |
| Backplane Current (24V) | 1A |
| 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 |
| Chassis Slots Occupied | 1 slot (left-most slot) |
| Dimensions (H × W × D) | Approx. 147 × 45 × 144 mm |
| Weight | Approx. 1.2 kg |
| Certifications | UL, CE, CSA, RCM |
| Enclosure Rating | Open-type (panel mount) |
Why Engineers Specify This Model
- 24V DC Input Compatibility: Directly powered from standard plant 24V DC distribution buses — no additional AC/DC converter required in many panel designs.
- 72W Backplane Power: Sufficient to support a fully populated 10-slot or 13-slot ControlLogix chassis with mixed I/O and communication modules.
- Hot-swap Capable: Supports live insertion and removal (RIUP — Remove and Insert Under Power) when used with compatible chassis, minimizing downtime during maintenance.
- Redundancy Ready: Can be paired with a second 1756-PB72 and a 1756-PSCA2 chassis adapter for redundant power configurations in high-availability applications.
- Compact Form Factor: Single-slot design preserves chassis real estate for I/O and communication modules.
- Wide Input Range: 18–32V DC tolerance accommodates voltage sag and surge common in industrial DC distribution systems.
- Proven Field Reliability: Part of the ControlLogix ecosystem with decades of global deployment in SIL-rated and non-SIL process environments.
Complete System Bill of Materials
A typical ControlLogix system powered by the 1756-PB72 includes the following components:
- 1756-PB72 — 24V DC Power Supply (this module)
- 1756-L7x / 1756-L8x — ControlLogix Controller (e.g., 1756-L73, 1756-L83E)
- 1756-A10 / 1756-A13 — ControlLogix Chassis (10-slot or 13-slot)
- 1756-EN2T / 1756-EN3TR — EtherNet/IP Communication Module
- 1756-IB16 / 1756-OB16E — Digital Input / Output Modules
- 1756-IF8 / 1756-OF8 — Analog Input / Output Modules
- 1756-PSCA2 — Power Supply Chassis Adapter (for redundant power)
- 1756-PB72 (second unit) — Redundant Power Supply
- 1492-CABLE series — Pre-wired I/O cables and terminal blocks
Contact [email protected] for complete BOM pricing and availability.
Compliance & Industry Standards
- UL 508 — Industrial Control Equipment
- CE Marking — EMC Directive 2014/30/EU & Low Voltage Directive 2014/35/EU
- CSA C22.2 No. 142 — Process Control Equipment
- IEC 61131-2 — Programmable Controllers Hardware Requirements
- RCM (Australia/NZ) — Regulatory Compliance Mark
- ATEX / IECEx — Not rated for Zone 0/1; use appropriate barriers for hazardous area installations
- ISA-88 — Compatible with batch process architectures when integrated with ControlLogix controllers
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified surplus channels with full traceability documentation.
- Each module undergoes incoming inspection: visual check, label verification, firmware/revision confirmation, and functional power-on test where applicable.
- Packaging inspected for signs of tampering, re-marking, or counterfeit indicators prior to dispatch.
- Revision levels and date codes disclosed upon request — critical for system compatibility verification.
- Certificate of Conformance (CoC) and test reports available for qualified orders.
- Konmask.com is an independent stocking distributor — not an authorized Rockwell Automation reseller. New, surplus-new, and refurbished grades available; condition clearly stated on each order.
How to Source This Part
- Confirm your chassis and power budget: Verify total backplane current draw across all installed modules does not exceed 72W.
- Check revision compatibility: Confirm the firmware revision of your controller is compatible with the power supply series revision.
- Request a quote: Email [email protected] with your required quantity, acceptable condition grade (new / surplus-new / refurbished), and delivery timeline.
- Expedited orders: Same-day shipping available for in-stock units. Call or WhatsApp +0086 19859288691 for urgent requirements.
- Volume pricing: Tiered discounts available for orders of 5+ units. OEM and system integrator accounts welcome.
Application-Specific FAQ
Q: Can the 1756-PB72 power a fully loaded 13-slot chassis?
A: It depends on the modules installed. The 72W output is sufficient for many mixed configurations, but you must calculate the total backplane current draw from each module’s datasheet. For high-density analog or motion configurations, consider the 1756-PA75 (AC input, 75W) or a redundant dual-supply setup.
Q: Is the 1756-PB72 compatible with the 1756-A17 17-slot chassis?
A: Yes, physically compatible. However, a 17-slot chassis with a full complement of modules will typically exceed 72W. A redundant pair of 1756-PB72 units or a higher-wattage supply is recommended.
Q: Can I replace a 1756-PA72 (AC input) with a 1756-PB72 (DC input)?
A: Functionally equivalent in output power (72W), but the input source differs — AC vs. 24V DC. Ensure your panel has a suitable 24V DC supply before substituting. The backplane connector and slot footprint are identical.
Q: Does the 1756-PB72 support redundant power configurations?
A: Yes. Use two 1756-PB72 units with a 1756-PSCA2 Power Supply Chassis Adapter to achieve redundant power. If one supply fails, the other maintains backplane power without interruption.
Q: What is the lead time for new units?
A: In-stock units ship within 1–3 business days. For new factory-sealed units, lead time varies by region — contact us for current availability.
Q: Do you provide documentation and test reports?
A: Yes. Certificate of Conformance, incoming inspection records, and revision/date code information are available upon request for qualified orders.
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