Allen-Bradley 1786-BNC ControlNet Media Coaxial BNC Connector | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1786-BNC is a ControlNet media coaxial BNC connector designed for use in Rockwell Automation ControlNet network infrastructure. It provides a reliable, low-loss coaxial termination point for ControlNet trunk and drop cables, ensuring signal integrity across industrial automation networks. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement teams.
Technical Specifications
- Part Number: 1786-BNC
- Manufacturer: Allen-Bradley / Rockwell Automation
- Product Family: ControlNet Media
- Connector Type: BNC (Bayonet Neill–Concelman) Coaxial
- Network Protocol: ControlNet (IEEE 802.4 / IEC 61158)
- Cable Compatibility: RG-6 coaxial cable (ControlNet-rated)
- Impedance: 75 Ω
- Termination Style: Crimp / Compression
- Operating Temperature: -20°C to +70°C
- Weight: Approx. 80 g (packaged)
- Compliance: CE, UL listed
- Country of Origin: USA
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as replacements or equivalents for the 1786-BNC in ControlNet installations. Always verify electrical and mechanical compatibility before substitution:
- 1786-BNCJ — Allen-Bradley BNC connector, jack variant; same ControlNet media family
- 1786-BNCR — Right-angle BNC variant for space-constrained panel installations
- 1786-TPS — ControlNet tap/splitter; used when network topology requires signal splitting
- Generic RG-6 BNC Crimp Connector (75 Ω) — Third-party equivalents available; must meet ControlNet impedance and shielding specs
- Belden 1694A-compatible BNC connectors — Widely used in ControlNet cabling; confirm crimp die compatibility
Note: Third-party replacements may void Rockwell Automation support agreements. Consult your system integrator before substitution in safety-critical applications.
Why Choose the Original Model
- Guaranteed ControlNet Compliance: Factory-tested to meet Rockwell Automation ControlNet media specifications
- Signal Integrity: Precision 75 Ω impedance matching minimizes reflections and network errors
- Rockwell Automation Support: Full OEM warranty and technical support coverage
- Proven Reliability: Deployed in thousands of industrial ControlNet installations worldwide
- Simplified Procurement: Single-source from authorized distributors with full traceability
Typical Applications
- ControlNet trunk cable termination in manufacturing automation cells
- PLC-to-PLC and PLC-to-I/O communication networks
- Automotive assembly line control systems
- Food & beverage processing automation
- Oil & gas distributed control system (DCS) networks
- Water/wastewater treatment plant SCADA networks
- Pharmaceutical batch control systems (21 CFR Part 11 environments)
System Compatibility
The 1786-BNC is compatible with the following Rockwell Automation ControlNet infrastructure components:
- ControlNet Scanners: 1756-CNB, 1756-CNBR, 1771-ACN15, 1771-ACNR15
- ControlNet Bridges: 1786-RPCD, 1786-RPFM
- ControlNet Taps: 1786-TPS, 1786-TPYR
- ControlNet Repeaters: 1786-RPCD
- PLC Platforms: ControlLogix (1756), CompactLogix (1769), FlexLogix (1794)
- Cable: Belden 1694A, 1694F, or equivalent RG-6 75 Ω ControlNet-rated coaxial cable
Selection Guide
Use the following criteria to confirm the 1786-BNC is the correct connector for your application:
- Network Type: Must be ControlNet (not EtherNet/IP or DeviceNet — those use different connectors)
- Cable Type: Confirm RG-6 coaxial cable is in use; check cable OD for crimp die selection
- Connector Orientation: Standard inline — if right-angle is needed, select 1786-BNCR
- Quantity: Each cable end requires one BNC connector; trunk segments require two per cable
- Environment: For harsh environments (high vibration, moisture), consider additional strain relief or conduit protection
- Regulatory: For SIL-rated or safety-instrumented systems, confirm connector is approved in your SIS documentation
Quality Assurance & Sourcing
- Source: Konmask.com sources 1786-BNC connectors from authorized distributors and verified surplus channels
- Inspection: Each unit undergoes visual inspection and packaging verification prior to shipment
- Traceability: Original manufacturer labeling and date codes preserved where available
- Condition: New, surplus-new, and refurbished options available — condition clearly stated at time of order
- Anti-Counterfeit: We do not source from unverified grey-market channels; all stock is traceable to authorized supply chains
How to Order
- Step 1: Confirm part number: 1786-BNC
- Step 2: Specify quantity and required condition (new / surplus-new / refurbished)
- Step 3: Contact us via email or phone for availability and lead time confirmation
- Step 4: Receive formal quotation with pricing, lead time, and shipping options
- Step 5: Place order via our online store or purchase order (PO accepted for qualified accounts)
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Replacement & Compatibility FAQ
Q: Can I use a standard 75 Ω BNC connector instead of the 1786-BNC?
A: Electrically possible in some cases, but not recommended. The 1786-BNC is specified to ControlNet media standards. Generic connectors may introduce impedance mismatches or fail to meet shielding requirements, causing network errors.
Q: Is the 1786-BNC compatible with EtherNet/IP networks?
A: No. EtherNet/IP uses standard RJ45 connectors. The 1786-BNC is exclusively for ControlNet coaxial infrastructure.
Q: What crimp tool is required for the 1786-BNC?
A: Rockwell Automation recommends using a compatible BNC crimp tool sized for RG-6 cable. Consult the ControlNet Media Planning and Installation Guide (publication CNET-IN002) for tooling specifications.
Q: Can the 1786-BNC be used on both trunk and drop cables?
A: Yes. The 1786-BNC is used on both trunk cable ends and drop cable connections to ControlNet taps.
Q: What is the lead time for the 1786-BNC from Konmask.com?
A: Lead time varies by stock availability. Contact us directly for current inventory status and estimated delivery.
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Contact: support@konmask.com | +0086 19859288691
