Allen-Bradley 1797-PS1N Flex Ex Power Supply Module | Quad-Ex DC Output for Hazardous Locations

Allen-Bradley 1797-PS1N Flex Ex Power Supply Module (Intrinsically Safe DC Output System)

The Allen-Bradley 1797-PS1N is an industrial-grade Flex Ex power supply module designed for hazardous location control systems. Through intrinsically safe (IS) technology and Quad-Ex DC output architecture, it delivers reliable, isolated power distribution to field devices in Zone 0/1/2 (IECEx) and Division 1/2 (NEC) classified areas.

Engineered for oil & gas facilities, chemical processing plants, pharmaceutical manufacturing, and mining operations where explosive atmospheres demand certified protection. This module solves critical challenges including power isolation failures, certification compliance gaps, installation complexity in hazardous zones, and limited diagnostic visibility in remote field applications.

Featuring factory-certified intrinsically safe design with modular installation flexibility, the 1797-PS1N offers seamless integration with Flex Ex I/O systems, comprehensive fault diagnostics, hot-swappable capability, and global hazardous location certifications. Ideal for system integrators, control panel builders, EPC contractors, and plant maintenance teams requiring certified power solutions. Contact our application engineers for zone classification verification and technical specifications.

Core Features & Technical Advantages

• Intrinsically Safe Certification
  Factory-certified to IECEx, ATEX, and NEC 505/500 standards for use in explosive gas and dust environments, eliminating the need for additional barriers or enclosures while ensuring personnel safety and regulatory compliance.
• Quad-Ex DC Output Architecture
  Provides four independent intrinsically safe DC output channels with individual current limiting and short-circuit protection, enabling flexible power distribution to multiple field devices while maintaining zone integrity.
• Seamless Flex Ex System Integration
  Direct mounting compatibility with 1797 Flex Ex I/O chassis, sharing common backplane communication and power distribution, reducing wiring complexity and installation time by up to 40% compared to traditional barrier systems.
• Advanced Diagnostic Capabilities
  Real-time monitoring of output voltage, current draw, and fault conditions with LED status indicators and network-accessible diagnostics, minimizing troubleshooting time and reducing unplanned downtime.
• Hot-Swappable Design
  Field-replaceable module with keyed connectors and retention clips allows maintenance without system shutdown, critical for continuous process operations in refineries and chemical plants.
• Wide Operating Temperature Range
  Rated for -40°C to +70°C ambient operation with conformal coating protection, suitable for outdoor installations, offshore platforms, and extreme industrial environments.

Typical Application Scenarios

The 1797-PS1N power supply module is engineered for applications requiring certified intrinsically safe power in hazardous locations, particularly where:

• Oil & Gas Upstream Production
  Wellhead monitoring systems, separator control panels, and tank farm instrumentation in Zone 1 classified areas. Provides certified power to pressure transmitters, flow meters, and valve positioners while maintaining explosion-proof integrity.
• Chemical Process Manufacturing
  Reactor control systems, distillation column instrumentation, and batch process monitoring in Division 1 environments. Supports integration with DCS systems through Flex Ex distributed I/O architecture for real-time process control.
• Pharmaceutical Clean Room & Hazardous Areas
  Solvent handling systems, powder processing equipment, and sterile manufacturing zones requiring both intrinsic safety and contamination control. Meets FDA 21 CFR Part 11 compliance requirements when integrated with validated control systems.
• Mining & Mineral Processing
  Underground coal mine monitoring, methane detection systems, and conveyor control in explosive dust environments. Certified for Group I (mining) applications with robust vibration and shock resistance.
• Offshore Platform & Marine Applications
  FPSO control systems, subsea equipment monitoring, and marine loading terminal instrumentation. Salt-fog resistant construction with IP67 rating when properly installed in approved enclosures.

Technical Specifications & Selection Guide

To ensure optimal system performance and compliance, the 1797-PS1N is available with the following certified specifications. Custom configurations available for project-specific requirements.

Selection Considerations

When specifying the 1797-PS1N for your application, consider the following critical parameters:

• Hazardous Area Classification: Verify zone/division rating, gas group (IIA/IIB/IIC), and temperature class (T1-T6) match your site classification documents
• Field Device Power Budget: Calculate total current draw of connected transmitters, valves, and sensors; ensure sum does not exceed 300mA per channel with 20% safety margin
• Cable Length & Voltage Drop: For installations exceeding 100 meters, consult voltage drop calculations to maintain minimum 18V at device terminals
• Environmental Conditions: Confirm ambient temperature, humidity, vibration, and chemical exposure are within module ratings
• System Architecture: Determine required number of I/O modules, communication protocol (DeviceNet, ControlNet, EtherNet/IP), and chassis size

For application-specific selection assistance, provide our engineering team with: hazardous area classification drawings, field device list with power requirements, cable routing distances, environmental conditions, and control system architecture. We will recommend optimized configuration with compliance documentation.

Extended Capabilities & System Integration

• Network Diagnostics Integration: Module status accessible via Flex Ex network interface, enabling integration with PlantPAx DCS, FactoryTalk View HMI, and third-party SCADA systems for centralized monitoring
• Redundant Power Options: Compatible with 1797-PS2E redundant power supply for critical applications requiring N+1 availability
• Mixed I/O Configuration: Supports combination with digital input, analog input, and relay output modules on same chassis for complete field device interface
• Global Certification Package: Includes IECEx CoC, ATEX certificate, NEC drawings, and installation manuals for multi-region project deployment

Delivery, Service & Quality Assurance

Lead Time: Factory-sealed units typically ship within 3-5 business days from regional distribution centers. Custom-configured systems or large quantity orders: 2-3 weeks. Expedited service available for critical shutdowns.

Warranty: 12-month manufacturer warranty covering defects in materials and workmanship. Extended warranty and advance replacement programs available for mission-critical installations.

Technical Support: Complimentary pre-sale application engineering, post-installation commissioning assistance (remote or on-site depending on location), and lifetime technical support via phone and email. Access to certified system integrators and panel builders in your region.

Documentation Package: Each module ships with intrinsic safety control drawing (blue print), installation instructions, hazardous location certification certificates, wiring diagrams, and quick-start guide. CAD files and 3D models available for panel design.

Quality Certifications: Manufactured in ISO 9001:2015 certified facilities with full traceability. Meets RoHS and REACH compliance for global deployment.

Frequently Asked Questions (FAQ)

Q: How does the 1797-PS1N Flex Ex power supply module integrate with existing Allen-Bradley control systems?
A: The module mounts directly onto 1797 Flex Ex I/O chassis and shares the common backplane for power and diagnostics. It's compatible with DeviceNet, ControlNet, and EtherNet/IP adapters, allowing seamless integration with ControlLogix, CompactLogix, and PlantPAx systems. Configuration is performed through RSLogix/Studio 5000 software using standard Add-On Profiles (AOP).

Q: What is the maximum number of field devices one 1797-PS1N module can power?
A: The module provides four independent IS output channels, each rated for 300mA maximum. Total device count depends on individual device current draw—for example, you can power up to 12 standard 4-20mA transmitters (assuming 25mA each) or 4 smart positioners (assuming 250mA each). Consult device datasheets for exact power requirements.

Q: What energy savings or efficiency improvements does this intrinsically safe power supply offer?
A: While the primary benefit is safety certification rather than energy savings, the module's high-efficiency DC-DC conversion (>85% typical) and individual channel current limiting reduce wasted power compared to traditional Zener barrier systems. Eliminating separate barrier panels also reduces installation footprint and associated cooling requirements.

Q: What are the environmental and installation requirements for the 1797-PS1N?
A: The module is rated IP20 for DIN rail mounting inside control panels. When installed in NEMA 4X/IP67 rated enclosures, the complete assembly achieves higher protection. Operating temperature range is -40°C to +70°C with 5-95% non-condensing humidity. Ensure adequate ventilation (minimum 50mm clearance) and avoid direct sunlight or corrosive gas exposure.

Q: Does the 1797-PS1N support remote monitoring and data acquisition for predictive maintenance?
A: Yes, the module provides diagnostic data including output voltage, current per channel, fault status, and temperature via the Flex Ex backplane. This data is accessible through EtherNet/IP, DeviceNet, or ControlNet networks using standard CIP (Common Industrial Protocol) objects, enabling integration with FactoryTalk Analytics, Azure IoT, or third-party condition monitoring platforms.

Q: Can I use the 1797-PS1N in SIL-rated safety applications?
A: The 1797-PS1N is designed for standard process control applications in hazardous locations. For Safety Instrumented Systems (SIS) requiring SIL 2/3 certification, consider Allen-Bradley GuardLogix or third-party certified safety barriers. Consult our functional safety engineers for application-specific recommendations and certification documentation.

Request Technical Support & Custom Configuration

To receive detailed selection guidance, compliance documentation, or project quotation, please provide the following information to our application engineering team:

• Project name and site location with hazardous area classification (Zone/Division, Gas Group, Temp Class)
• Field device list including manufacturer, model, and power consumption specifications
• Cable run distances from control panel to field devices
• Quantity required and preferred delivery schedule
• Control system platform (ControlLogix, CompactLogix, PLC-5, etc.) and network protocol
• Environmental conditions: ambient temperature range, humidity, vibration, chemical exposure

Our certified engineers will provide optimized system architecture, compliance verification, and competitive pricing within 24 hours for standard configurations.

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