Schneider Electric 990NAD21110 Modbus Plus Drop Cable | Replacement, Equivalent & Selection Guide
The Schneider Electric 990NAD21110 is a 1-meter Modbus Plus drop cable (tap link cable) used to connect field devices and PLCs to a Modbus Plus trunk network. Designed for use with Modicon PLC systems, this cable provides reliable, noise-resistant communication in industrial automation environments. At Konmask.com, we supply genuine and compatible-grade 990NAD21110 cables with full traceability for B2B buyers worldwide.
Technical Specifications
- Part Number: 990NAD21110
- Manufacturer: Schneider Electric (Modicon)
- Series: Modbus Plus Network Accessories
- Type: Drop Cable / Tap Link Cable
- Cable Length: 1 meter (3.28 ft)
- Connector Type: DB9 (9-pin) to Modbus Plus Tap
- Protocol: Modbus Plus (MB+)
- Shielding: Shielded twisted pair
- Operating Temperature: 0°C to +60°C
- Application: Modicon 984, Quantum, Premium PLC series
Compatible Replacement & Equivalent Models
The following models are functionally equivalent or compatible alternatives to the 990NAD21110:
- 990NAD21100 – Modbus Plus drop cable, 0.5m (shorter version)
- 990NAD21120 – Modbus Plus drop cable, 2m (longer version)
- 990NAD21130 – Modbus Plus drop cable, 3m
- AS-MBKT-085 – Legacy Modicon Modbus Plus tap kit (older equivalent)
- Third-party shielded DB9 Modbus Plus tap cables with matching pinout
Note: Always verify connector pinout and cable length before substituting. Contact Konmask.com for cross-reference verification.
Why Choose the Original 990NAD21110
- Factory-certified for Modbus Plus signal integrity and impedance matching
- Guaranteed compatibility with all Modicon Quantum, Premium, and 984 PLCs
- Shielded construction minimizes EMI interference in industrial environments
- Plug-and-play installation — no configuration required
- Backed by Schneider Electric’s global support and documentation
Typical Applications
- Connecting Modicon PLCs to Modbus Plus trunk network segments
- Factory automation and process control systems
- Oil & gas, water treatment, and power distribution SCADA systems
- Machine tool and conveyor line control panels
- Retrofitting or expanding existing Modbus Plus networks
System Compatibility
- Modicon Quantum (140 series) PLCs
- Modicon Premium (TSX series) PLCs
- Modicon 984 series PLCs
- Modbus Plus network tap blocks (990NAD series)
- SA85 / AT984 PC interface cards
Selection Guide
Choose the correct drop cable length based on the distance between your tap block and the device port:
- 0.5m – 990NAD21100: Panel-mounted devices in close proximity
- 1m – 990NAD21110: Standard cabinet installations (most common)
- 2m – 990NAD21120: Devices mounted further from the trunk tap
- 3m – 990NAD21130: Extended reach for large enclosures or remote drops
Maximum drop cable length per Modbus Plus specification: 6 meters total per tap. Do not exceed this limit to maintain signal integrity.
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified surplus channels
- Each cable inspected for connector integrity and shielding continuity
- Traceability documentation available upon request
- Konmask.com specializes in industrial automation components for B2B buyers
- Export-ready packaging with ESD protection where applicable
How to Order
- SKU: 990NAD21110
- Add to cart directly, or contact us for bulk pricing and lead time
- Email: [email protected]
- Phone/WhatsApp: +0086 19859288691
- We accept T/T, PayPal, and major credit cards
- Global shipping available — DHL, FedEx, UPS
Replacement & Compatibility FAQ
Q: Can I use a standard RS-485 cable instead of 990NAD21110?
A: No. Modbus Plus uses a proprietary token-passing protocol over a specific cable impedance. Standard RS-485 cables are not compatible.
Q: Is 990NAD21120 (2m) interchangeable with 990NAD21110 (1m)?
A: Functionally yes, if the extra cable length is acceptable. Ensure total drop length does not exceed 6m.
Q: Does Konmask.com offer warranty on this cable?
A: Yes — 90-day warranty on all stocked items. Contact us for details.
Q: Can this cable be used with Modbus RTU or Modbus TCP systems?
A: No. This cable is specific to Modbus Plus (MB+) networks only.
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