1797-BIC FLEX Ex Bus Isolator (Industrial-Grade Intrinsic Safety Barrier)

The 1797-BIC serves as a critical safety interface between your control system and field instrumentation in explosive atmospheres. Engineered for oil & gas, chemical processing, and mining operations, this bus isolator delivers galvanic isolation for up to 8 FLEX Ex I/O modules while maintaining full compliance with ATEX, IECEx, FM, and cULus standards. Whether you're retrofitting legacy systems or designing new installations for Class I Division 1 environments, the 1797-BIC ensures reliable signal integrity without compromising worker safety.

Designed for system integrators and plant engineers managing hazardous location control, this isolator eliminates the complexity of traditional barrier installations. Its hot-swappable architecture minimizes unplanned downtime, while the transparent integration with ControlLogix and CompactLogix platforms accelerates commissioning timelines by up to 40%.

Key advantages: ATEX/IECEx dual certification for global deployments, supports mixed analog/digital I/O configurations, maintenance-free operation with visual diagnostics, and proven compatibility across Allen-Bradley distributed I/O ecosystems.

Core Features & Benefits

✓ Multi-Standard Safety Certification
ATEX [Ex ib] IIC approval for Zone 1 and Zone 2 applications, plus FM/cULus Class I Division 1 certification. Deploy confidently across international jurisdictions without re-engineering—reducing compliance costs by 30-50% compared to region-specific solutions.

✓ 8-Module Expansion Capacity
Connect any combination of FLEX Ex analog inputs, digital outputs, or specialty modules. Scalable architecture grows with your process requirements while maintaining consistent safety parameters across all channels.

✓ Galvanic Isolation Technology
DIN EN 60079-11 compliant isolation protects control systems from ground loops and electrical faults. Prevents cascade failures in multi-zone installations—critical for maintaining production continuity in 24/7 operations.

✓ Wide Operating Temperature Range
-20°C to 70°C (-4°F to 158°F) operational capability handles extreme climates from Arctic offshore platforms to Middle Eastern refineries. No derating required within specification limits.

→ Hot-Swap Serviceability
Replace modules during live operation without system shutdown. Reduces mean time to repair (MTTR) by 60% compared to traditional barrier systems—translating to $15,000-$50,000 annual savings in avoided downtime for typical process units.

→ Visual Status Indication
Green LED power indicator enables rapid troubleshooting during commissioning and routine inspections. Simplifies compliance documentation for safety audits.

Typical Application Scenarios

Offshore Oil & Gas Production
Challenge: Monitor wellhead pressures and separator levels in Zone 1 classified areas while maintaining SIL-rated safety systems.
Solution: The 1797-BIC isolates up to 8 pressure transmitters and level sensors, enabling real-time SCADA integration without compromising intrinsic safety barriers. Supports subsea control modules in FPSO and platform applications.

Chemical Reactor Monitoring
Challenge: Acquire temperature, pH, and flow data from batch reactors handling flammable solvents in Zone 2 environments.
Solution: Pair with 1797-IE8 analog input modules to capture 4-20mA signals from intrinsically safe transmitters. Galvanic isolation prevents ground-referenced noise from corrupting critical process variables.

Pharmaceutical Solvent Handling
Challenge: Control pneumatic valves and monitor tank levels in cleanroom-adjacent solvent storage areas requiring both explosion protection and GMP compliance.
Solution: Integrate 1797-OB8 digital output modules through the BIC isolator for valve actuation, while maintaining audit trails through FactoryTalk Historian for 21 CFR Part 11 compliance.

Underground Coal Mining
Challenge: Operate conveyor interlocks and methane detection systems in explosive dust atmospheres per MSHA regulations.
Solution: Deploy in conjunction with FLEX Ex digital I/O for distributed control of longwall equipment. Rugged -20°C rating withstands underground temperature extremes.

Paint Spray Booth Automation
Challenge: Automate paint flow control and booth pressure monitoring in Class I Division 1 spray areas.
Solution: The 1797-BIC enables centralized PLC control of intrinsically safe sensors and actuators, eliminating costly purged enclosures while meeting NFPA 33 requirements.

Technical Parameters & Selection Guide

Selection Criteria: Calculate total I/O point count and signal types required in your hazardous zone. Verify field device entity parameters (Ci, Li) remain within isolator output limits (Co=39μF, Lo=100μH for CENELEC). For applications exceeding 8 modules, deploy multiple 1797-BIC units on separate Flexbus segments. Consult cable capacitance/inductance specifications when planning installations beyond 100 meters.

Extended Functions

FactoryTalk Integration: Seamless data exchange with FactoryTalk View SE/ME for HMI visualization and FactoryTalk Historian for long-term trending. Supports CIP Safety protocols when paired with GuardLogix controllers for SIL 2/3 applications.

Distributed I/O Architecture: Extend control up to 500 meters from ControlLogix chassis using fiber optic media converters. Ideal for tank farms and pipeline monitoring where centralized control rooms are distant from field instrumentation.

Redundancy Options: Deploy in parallel with redundant power supplies and controllers for high-availability systems. Hot-swap capability ensures zero-downtime module replacement during scheduled maintenance windows.

Custom Entity Parameters: Factory configuration available for non-standard field device combinations. Contact technical support for applications requiring modified Co/Lo values or special voltage/current limits.

Delivery & Service Assurance

Lead Time: Stock items ship within 2-3 business days. Custom-configured units require 4-6 weeks for factory programming and certification documentation.

Warranty: 12-month manufacturer defect coverage from date of shipment. Extended warranties available for critical infrastructure projects.

Technical Support: Pre-sales application engineering assistance included. Post-installation support via phone/email Monday-Friday 8AM-6PM EST. Emergency 24/7 hotline for production-down situations.

Documentation Package: Includes installation manual, entity parameter certificates, ATEX/IECEx declarations of conformity, and AutoCAD DWG mechanical drawings. Studio 5000 EDS files available for download.

Frequently Asked Questions

How do I verify compatibility between the 1797-BIC isolator and my existing field transmitters?
Compare your transmitter's entity parameters (Ci, Li, Pi) against the isolator's output limits listed in the certification documents. The sum of cable capacitance plus transmitter Ci must not exceed Co (39μF for CENELEC). Similarly, cable inductance plus Li must remain below Lo (100μH). Our application engineers can perform this calculation during the quoting process.

What is the maximum cable run length from the isolator to field devices in Zone 1 areas?
Cable length depends on cable type and field device parameters. Typical installations use Belden 9841 (50pF/m, 0.6μH/m), allowing approximately 600-800 meters before exceeding entity limits. Always calculate based on actual cable specifications and device datasheets.

Can the 1797-BIC support both 4-20mA analog signals and discrete digital I/O simultaneously?
Yes. Mix any combination of FLEX Ex modules (1797-IE8 analog input, 1797-OB8 digital output, etc.) up to the 8-module limit. Each module type has independent entity parameters, so verify calculations for each channel.

Does this isolator require special programming in RSLogix 5000 or Studio 5000 software?
No. The 1797-BIC is transparent to the controller—it appears as a standard FLEX I/O adapter. Configure connected modules using their respective Add-On Profiles (AOP) exactly as you would in non-hazardous installations. The isolator handles intrinsic safety barriers automatically.

What maintenance intervals are recommended for hazardous area installations?
The 1797-BIC requires no scheduled maintenance under normal conditions. Perform visual inspections quarterly: verify LED status, check terminal tightness (torque to 0.5-0.6 Nm), and inspect for physical damage. Document inspections per your facility's Management of Change (MOC) procedures.

How does the 1797-BIC compare to traditional Zener barrier installations for cost and complexity?
Initial hardware cost is 20-30% higher than discrete barriers, but installation labor drops 50-70% due to pre-wired Flexbus connectivity and elimination of individual barrier mounting/wiring. Total installed cost typically favors the 1797-BIC for systems with 12+ I/O points. Additionally, hot-swap capability reduces lifecycle costs through faster MTTR.

Ready to Secure Your Hazardous Area Control System?

Contact our application engineers today for a free compatibility assessment and project-specific entity parameter calculations. We'll help you design a compliant, cost-effective FLEX Ex solution tailored to your Zone 1/2 requirements—backed by fast delivery and expert technical support.

Request a quote now or call +0086 187 5021 5667 for immediate assistance.

© 2026 NINERMAS COMPANY LIMITED. All rights reserved.
Original Source: https://ninermas.com
Contact: sale@ninermas.com | +0086 187 5021 5667