Schneider Electric 490NAA27103 Plus Trunk Cable | Replacement, Equivalent & Selection Guide
The Schneider Electric 490NAA27103 is a Modbus Plus (MB+) trunk cable designed for peer-to-peer industrial network communication in Schneider/Modicon PLC and DCS systems. This page provides full technical specifications, compatible replacement options, application guidance, and a structured selection guide to help engineers and procurement teams make the right sourcing decision.
Technical Specifications
| Part Number | 490NAA27103 |
| Manufacturer | Schneider Electric (Modicon) |
| Cable Type | Modbus Plus (MB+) Trunk Cable |
| Length | 3 m (approx.) |
| Connector Type | DB9 (9-pin) male/female |
| Network Standard | Modbus Plus (RS-485 based, 1 Mbps) |
| Shielding | Foil + braid shielded, twisted pair |
| Operating Temperature | 0°C to +60°C |
| Weight | 160 g |
| Compliance | CE, UL listed |
| Application | Modbus Plus peer-to-peer network trunk segment |
Compatible Replacement & Equivalent Models
The following models are commonly referenced as functional equivalents or drop-in replacements for the 490NAA27103. Always verify pinout, length, and shielding requirements before substitution:
- 490NAA27103 – Original OEM (Schneider Electric / Modicon)
- 490NAA27101 – 1 m variant, same connector and network standard
- 490NAA27106 – 6 m variant for longer trunk runs
- 490NAA27110 – 10 m variant for extended segment distances
- Third-party MB+ trunk cables – Must meet RS-485 shielded twisted-pair spec with DB9 termination; verify impedance (150 Ω) and capacitance per meter
Note: Konmask.com stocks both OEM and verified-compatible alternatives. Contact us for cross-reference confirmation.
Why Choose the Original Model
- ✅ Guaranteed compatibility with all Modicon Quantum, Premium, and Momentum PLCs using Modbus Plus
- ✅ Factory-tested to Schneider Electric network integrity standards
- ✅ Pre-terminated connectors eliminate field wiring errors
- ✅ Consistent impedance matching prevents signal reflection on long trunk runs
- ✅ Traceable manufacturing with full documentation for regulated industries
Typical Applications
- Modbus Plus peer-to-peer network trunk segment connections
- Modicon Quantum PLC to remote I/O drops (RIO)
- Modicon Premium / Momentum PLC network daisy-chain wiring
- Factory automation, process control, and SCADA backbone cabling
- Panel-to-panel trunk extension in distributed control architectures
- Replacement cabling in legacy MB+ networks during maintenance or expansion
System Compatibility
- Modicon Quantum – 140CPU series with MB+ port
- Modicon Premium – TSX57 series with PCMCIA MB+ card
- Modicon Momentum – 171CCC series processors
- Modicon 984 – Legacy MB+ network nodes
- Schneider Electric SA85 / AT984 – PC-based MB+ interface cards
- Bridge Multiplexer (BM85) – Multi-drop network bridging
Not compatible with Modbus RTU (RS-232/RS-485 serial) or Modbus TCP/IP (Ethernet) networks — these use different physical layer cabling.
Selection Guide
Use the table below to select the correct 490NAA series trunk cable for your installation:
| Part Number | Length | Recommended Use |
|---|---|---|
| 490NAA27101 | 1 m | Short panel-to-panel or module-to-module connections |
| 490NAA27103 | 3 m | Standard trunk segment (most common) |
| 490NAA27106 | 6 m | Medium-distance drops within a control cabinet row |
| 490NAA27110 | 10 m | Long-distance trunk runs between panels |
Key selection criteria:
- Total MB+ trunk segment length must not exceed 450 m (with repeaters)
- Maximum 32 nodes per segment without repeater
- Use 490NAA27003 termination resistor plugs at both ends of each trunk segment
- Do not mix shielded and unshielded cable on the same segment
Quality Assurance & Sourcing
All Schneider Electric components supplied by Konmask.com are sourced through verified industrial distribution channels. Each unit undergoes:
- Visual inspection and packaging integrity check
- Part number and label verification against OEM documentation
- Continuity and shielding integrity test (on request)
We supply both new OEM stock and new-surplus / refurbished units clearly labeled by condition. Certificates of conformance and test reports are available upon request for regulated industries.
How to Order
- Online: Add to cart directly from this page
- Email RFQ: [email protected] — include part number, quantity, and required delivery date
- Phone / WhatsApp: +0086 19859288691
- Bulk / project orders: Request a formal quotation with lead time and freight options
Typical lead time: 1–5 business days for in-stock items. Custom lengths or special configurations available on request.
Replacement & Compatibility FAQ
Q: Can I use a standard RS-485 cable instead of 490NAA27103?
A: Not recommended. Modbus Plus requires 150 Ω characteristic impedance shielded twisted-pair cable with DB9 connectors. Generic RS-485 cable may cause signal integrity issues on longer runs.
Q: Is 490NAA27103 compatible with Modbus RTU networks?
A: No. Modbus Plus and Modbus RTU are different physical and protocol layers. This cable is for MB+ only.
Q: What is the maximum number of 490NAA27103 cables I can daisy-chain?
A: The total trunk length per segment is limited to 450 m. You can chain multiple cables as long as the total does not exceed this limit and termination resistors are installed at both ends.
Q: Can Konmask supply other lengths or custom-terminated cables?
A: Yes. Contact us with your requirements for a custom quote.
Q: Do you provide documentation for regulated industries?
A: Yes. Certificates of conformance, test reports, and traceability documentation are available on request.
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Contact: [email protected] | +0086 19859288691
