Bus Isolation Solution — Allen-Bradley 1797-BIC | FLEX I/O Series
Where This Product Is Used
The Allen-Bradley 1797-BIC Bus Isolator Module is deployed wherever a FLEX I/O node must be electrically isolated from adjacent segments on the same backplane. Typical installation environments include:
- Automotive Assembly Lines — isolating servo drive feedback nodes from PLC I/O banks to suppress ground-loop interference.
- Water & Wastewater Treatment Plants — separating analog sensor clusters (pH, turbidity, flow) from digital output banks controlling pumps and valves.
- Oil & Gas Wellhead Panels — partitioning intrinsically safe (IS) field wiring segments from general-purpose I/O within the same enclosure.
- Food & Beverage Processing — isolating washdown-zone I/O from dry-area control modules to prevent moisture-induced leakage currents.
- Pharmaceutical Manufacturing (FDA 21 CFR Part 11) — creating discrete, auditable I/O segments for validated process steps.
- Power Generation & Utilities — blocking high-voltage transients on field wiring from propagating across the FLEX backplane.
Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 1797-BIC |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Family | FLEX I/O |
| Module Type | Bus Isolator / Terminator |
| Backplane Compatibility | 1797 FLEX I/O Terminal Base |
| Isolation Function | Electrically isolates left-side bus from right-side bus on the backplane |
| Power Consumption | No active power draw (passive isolation) |
| 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 |
| Weight | Approx. 200 g |
| Enclosure Rating | Open-style (requires panel or enclosure mounting) |
| Agency Certifications | UL, CE, CSA (verify current listing with Rockwell) |
Why Engineers Specify This Model
- Segment-Level Fault Containment — A fault or wiring error on one bus segment cannot propagate to adjacent segments, dramatically reducing unplanned downtime.
- Mixed-Voltage I/O Architecture — Enables 24 VDC and 120 VAC I/O modules to coexist on the same physical backplane rail without cross-contamination.
- Zero Software Configuration — The 1797-BIC is transparent to the ControlLogix/FlexLogix controller; no RSLogix 5000 / Studio 5000 tag changes are required after insertion.
- Passive Design = High Reliability — No active components means no additional failure modes; MTBF is effectively the mechanical lifetime of the connector.
- Compact Form Factor — Occupies a single FLEX I/O slot, preserving rack density in space-constrained panels.
- Backward Compatible — Interoperable with all 1794 and 1797 series terminal bases and adapters.
Complete System Bill of Materials
The 1797-BIC is typically ordered alongside the following components for a complete isolated FLEX I/O node:
- 1797-AENTR — EtherNet/IP Adapter (dual-port, Device Level Ring capable)
- 1797-TB3 — 3-wire Terminal Base for I/O modules
- 1797-TB3S — 3-wire Screw Terminal Base (spring-clamp variant)
- 1797-IB16 — 16-point 24 VDC Digital Input Module
- 1797-OB16 — 16-point 24 VDC Digital Output Module
- 1797-IE8 — 8-channel Analog Input Module (4–20 mA / 0–10 V)
- 1797-PS1 — FLEX I/O Power Supply (24 VDC)
- 1492-CABLE — Pre-wired I/O Cable (application-specific length)
Contact Konmask.com for bundle pricing on multi-line BOM orders.
Compliance & Industry Standards
- IEC 61131-2 — Programmable Controllers: Equipment Requirements and Tests
- UL 508 — Industrial Control Equipment
- CSA C22.2 No. 142 — Process Control Equipment
- CE Marking — EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- RoHS Compliant — Restriction of Hazardous Substances (verify revision with Rockwell Automation)
- ATEX / IECEx — Not rated for Zone 0/1 hazardous areas in standalone configuration; consult Rockwell for IS barrier pairing.
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified surplus channels with documented chain of custody.
- Each module undergoes visual inspection, label verification, and functional continuity check prior to dispatch.
- Packaging inspected for tamper evidence; counterfeit-risk screening applied to all Allen-Bradley catalog numbers.
- Traceability records (lot code, date code, source) retained for 3 years and available on request.
- Returns accepted within 30 days for unused, unopened units in original packaging.
How to Source This Part
- Add to Cart — Select quantity and click Add to Cart. Volume pricing available for orders of 5+ units.
- Request a Quote — For BOM orders or urgent requirements, email support@konmask.com with your full part list and required delivery date.
- Lead Time — In-stock units ship within 1–2 business days (HKT). Express air freight available to most destinations.
- Payment — T/T (wire transfer), PayPal, and major credit cards accepted. Net-30 terms available for qualified accounts.
- Export Compliance — Konmask.com handles EAR99 classification documentation and commercial invoice preparation for cross-border shipments.
Application-Specific FAQ
Q: Can I use the 1797-BIC to isolate an intrinsically safe (IS) segment from a general-purpose segment?
A: The 1797-BIC provides electrical bus isolation on the backplane but is not a certified IS barrier. For IS applications, pair it with a certified Zener barrier or galvanic isolator on the field wiring side and consult your local Rockwell Automation safety specialist.
Q: Does inserting a 1797-BIC require a controller firmware update or RSLogix configuration change?
A: No. The module is transparent to the controller. Simply insert it into the desired slot on the terminal base rail; the adapter automatically recognizes the segment boundary. No I/O tree changes are needed in Studio 5000.
Q: How many 1797-BIC modules can I use on a single FLEX I/O adapter?
A: Rockwell Automation supports up to 8 I/O modules per 1797 adapter node. The 1797-BIC occupies one slot; plan your node architecture accordingly. Multiple BIC modules can be used to create multiple isolated sub-segments within the node limit.
Q: Is the 1797-BIC compatible with the older 1794 FLEX I/O platform?
A: The 1797-BIC is designed for the 1797 FLEX I/O terminal base system. It is not directly interchangeable with 1794-series hardware. Verify backplane compatibility before ordering.
Q: What is the typical lead time for urgent orders?
A: In-stock units ship within 1–2 business days from Hong Kong. DHL Express and FedEx International Priority options are available at checkout for time-critical requirements.
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