Allen Bradley 1797-PS1E SER B FlexEx Power Supply

Allen Bradley 1797-PS1E SER B FlexEx 85-253VAC DC OUT Power Supply V.03 95779002

The Allen Bradley 1797-PS1E SER B is a heavy-duty, intrinsically safe AC/DC power supply engineered specifically for the FlexEx distributed I/O product line. Designed to operate within hazardous industrial environments (Class I, Division 1 / Zone 1), this module converts standard plant AC power (85–253V AC) into regulated, isolated DC power required for the FlexEx backplane and connected field-side modules.

As a marine engineer writing from an industrial automation perspective, reliability in harsh, vibration-heavy, and corrosive atmospheres is paramount. The 1797-PS1E SER B (Catalog No. 1797-PS1E, Series B, Firmware V.03, Part No. 95779002) delivers robust fault tolerance, galvanic isolation, and strict compliance with global hazardous-area safety standards, ensuring uninterrupted control loop integrity on offshore platforms, chemical plants, and marine engine rooms.

Model Details

• Manufacturer: Allen Bradley (Rockwell Automation)
• Product Line: FlexEx I/O
• Model / Catalog Number: 1797-PS1E
• Series: Series B
• Revision / Version: V.03
• Item Part Number (MPN): 95779002

Technical Specifications

Key Features

1. Intrinsically Safe Design: Directly supplies power to FlexEx modules mounted in hazardous zones without risking ignition of explosive gas atmospheres.
2. Wide AC Input Range: Accommodates fluctuating global grid and generator supplies from 85V up to 253V AC.
3. Advanced Diagnostics: Built-in LED status indicators for power-ok, fault detection, and communication health.
4. Robust Thermal Management: Engineered for high-density panel mounting without requiring active forced-air cooling.
5. Hot-Swap Capability: Designed to allow replacement in non-hazardous or appropriately rated safe areas following strict lockout/tagout (LOTO) protocols.

Applications

• Offshore Oil and Drilling Production Platforms
• Marine Propulsion and Auxiliary Engine Control Rooms
• Petrochemical Refining and Distillation Units
• Natural Gas Pipeline Compression Stations
• Pharmaceutical Processing Plants with Solvent Vapor Risks

Compatible Equipment Models

• FlexEx Base Units: 1797-TB3, 1797-TB3S
• FlexEx Communication Adapters: 1797-AENT (EtherNet/IP), 1797-ADN (DeviceNet)
• FlexEx Digital & Analog I/O Modules: 1797-IE8, 1797-OE8, 1797-IB8, 1797-OB8

Part Number Cross-References

• Alternate Series: 1797-PS1E Series A
• Legacy Rockwell Part IDs: 95779002, 97105001

Frequently Asked Questions

What is the primary difference between Series A and Series B of the 1797-PS1E?

Series B incorporates updated internal component tolerances, improved thermal dissipation ratings, and revised firmware (V.03) to enhance compatibility with newer Allen Bradley FlexEx communication adapters and stricter modern EMC standards.

Can the 1797-PS1E power supply be installed directly inside a hazardous zone?

No. The power supply unit itself must be installed in a safe area or within an appropriately certified explosion-proof / purged enclosure (Ex d / Ex p) outside the immediate Class I, Div 1 hazard zone, while routing its intrinsically safe DC output cables into the hazardous field area.

What should I do if the module fault LED illuminates during operation?

First, check the AC input voltage stability using a true-RMS multimeter. Next, inspect the downstream FlexEx I/O modules for short circuits or over-current faults on the 31.2V DC output circuit. Cycle power only after clearing any physical field wiring faults.