Allen-Bradley 1746-C9 Chassis Interconnect Cable | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1746-C9 is a chassis interconnect cable designed for use with the SLC 500 modular chassis system. It enables reliable multi-chassis expansion by connecting two SLC 500 chassis together, extending the I/O capacity of your control system. This page provides full technical specifications, compatible replacement options, application guidance, and sourcing information to help engineers and procurement teams make confident selection decisions.
Technical Specifications
- Part Number: 1746-C9
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Description: SLC 500 Chassis Interconnect Cable
- Compatible Platform: SLC 500 Modular Chassis
- Cable Length: Approximately 0.9 m (3 ft) — verify with your chassis layout
- Connector Type: Multi-pin ribbon/bus connector for chassis-to-chassis link
- Weight: ~160 g
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Application: Connects local expansion chassis to the primary SLC 500 chassis
- Compliance: UL Listed, CE Marked (verify current revision with Rockwell)
Compatible Replacement & Equivalent Models
When the original 1746-C9 is unavailable or discontinued, the following models may serve as functional equivalents or replacements depending on your chassis configuration and cable length requirements. Always verify connector compatibility and cable length before substitution.
- 1746-C7 — Shorter chassis interconnect cable (~0.3 m); use when chassis are mounted adjacent
- 1746-C16 — Longer chassis interconnect cable (~1.6 m); use when chassis spacing exceeds 0.9 m
- 1746-C25 — Extended-length option (~2.5 m) for wider panel layouts
- Third-party equivalents — Compatible cables from certified automation suppliers may be used if they match the 1746-series bus connector pinout and shielding specification. Konmask can advise on verified alternatives upon request.
Note: Always cross-reference the Rockwell Automation 1746 Chassis Interconnect Cable Selection Guide (Publication 1746-IN009) before substituting.
Why Choose the Original Model
- Guaranteed compatibility with all SLC 500 modular chassis revisions
- Factory-tested signal integrity — no risk of bus errors or intermittent faults from non-spec cables
- Rockwell Automation warranty support — original parts maintain system warranty eligibility
- Consistent shielding and impedance — critical for noise immunity in industrial environments
- Long-term availability through authorized distribution channels including Konmask
Typical Applications
- SLC 500 multi-chassis I/O expansion in manufacturing lines
- Discrete and process control panels requiring more than one chassis
- Retrofit and upgrade projects replacing older SLC 5/01, 5/02, 5/03, 5/04, 5/05 systems
- Automotive, food & beverage, water treatment, and material handling automation
- OEM machine builders using SLC 500 as the primary control platform
System Compatibility
- Primary Chassis: 1746-A4, 1746-A7, 1746-A10, 1746-A13 (4, 7, 10, 13-slot)
- Expansion Chassis: 1746-A4, 1746-A7, 1746-A10, 1746-A13
- Processors: SLC 5/02 (1747-L524/L532), SLC 5/03, SLC 5/04, SLC 5/05
- Not compatible with: SLC 5/01 fixed controllers or MicroLogix platforms
- Maximum expansion: Up to 3 expansion chassis per local network (processor-dependent)
Selection Guide
Use the following criteria to select the correct 1746-C series cable for your application:
- Step 1 — Measure chassis spacing: Measure the physical distance between the rightmost slot of the primary chassis and the leftmost slot of the expansion chassis.
- Step 2 — Add routing allowance: Add 10–15 cm for cable routing and bend radius inside the panel.
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Step 3 — Select cable length:
- ≤ 0.3 m → 1746-C7
- 0.3 m – 0.9 m → 1746-C9 (this model)
- 0.9 m – 1.6 m → 1746-C16
- 1.6 m – 2.5 m → 1746-C25
- Step 4 — Verify processor support: Confirm your SLC processor supports the number of expansion chassis you plan to connect.
- Step 5 — Check revision: Confirm cable revision matches your chassis revision if working with early-generation SLC 500 hardware.
Quality Assurance & Sourcing
- All 1746-C9 units sourced by Konmask are inspected for physical integrity, connector condition, and labeling authenticity prior to dispatch.
- We source from authorized distributors and verified surplus channels with full traceability documentation available on request.
- Counterfeit risk mitigation: Konmask performs visual and functional checks aligned with Rockwell Automation’s product authentication guidelines.
- Certificates of conformance (CoC) and test reports available for qualified B2B orders.
How to Order
- Online: Add to cart directly from this page — stock availability shown in real time.
- Bulk / B2B inquiry: Email support@konmask.com with quantity, delivery location, and required lead time.
- Phone / WhatsApp: +0086 19859288691 — available for urgent sourcing requests.
- Quote requests: Include your full BOM or project list for volume pricing.
- Lead time: In-stock orders ship within 1–3 business days; sourced orders typically 5–15 business days.
Replacement & Compatibility FAQ
Q: Can I use a 1746-C16 instead of a 1746-C9 if the cable is too long?
A: Technically yes — a longer cable can be coiled, but excess length may introduce noise in high-EMI environments. Use the correct length whenever possible.
Q: Is the 1746-C9 compatible with the SLC 5/01?
A: No. The SLC 5/01 (1747-L511/L514) is a fixed controller and does not support chassis expansion via interconnect cables.
Q: Can third-party cables replace the 1746-C9?
A: Third-party cables with identical connector pinout and shielding may function correctly, but Rockwell Automation does not certify them. Use OEM cables for warranty-critical or safety-rated installations.
Q: How do I know if my 1746-C9 is faulty?
A: Common symptoms include I/O module faults, chassis communication errors (fault code 0026 or similar), or intermittent loss of expansion chassis. Swap the cable as a first diagnostic step.
Q: Does Konmask offer a warranty on this part?
A: Yes — Konmask provides a 90-day quality guarantee on all parts. Contact support@konmask.com for warranty claims.
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