1 3

Woodward 9905-971 Discrete Input Module

Woodward 9905-971 Discrete Input Module

Product Description

The 9905-971 is a high-reliability distributed I/O module developed by Woodward Inc. for the LinkNet Distributed Control Architecture. This module provides 16 discrete digital input channels for monitoring field device status in industrial automation systems.

Designed for...

23 people are viewing this right now

Availability: Low stock: 10 left

SKU: 9905-971
Vendor: Woodward
Category: LinkNet Discrete Input Module
Related Series:

Shipping & Returns

Reliable Worldwide Delivery

  • Carriers: Shipped via DHL, FedEx, UPS, or USPS.
  • Dispatch: Orders processed in 1-2 business days and dispatched within 3-5 business days.
  • Tracking: Full tracking details provided via email upon shipment.

30-Day Money-Back Guarantee

  • Guarantee: 30-day return window for in-stock, factory-sealed products.
  • Condition: Items must be unopened, unused, and in original packaging.
  • Authenticity: We guarantee 100% original and authentic hardware.

Need more details? Read our fullShipping PolicyandRefund Policy.

Authenticity & Warranty

  • Genuine Guarantee: We supply only 100% original, brand-new, and factory-sealed industrial automation parts.
  • Full Coverage: Every component is backed by a 12-month comprehensive warranty from the date of purchase.
  • Traceability: All products come with original factory documentation and accessories for full industrial compliance.

Technical Support & Sourcing

  • Expert Assistance: Our technical team provides free consultation to help you verify compatibility for DCS and PLC systems.
  • Rare Part Sourcing: Specializing in obsolete and hard-to-find components from Allen-Bradley, Siemens, ABB, HIMA, and more.
  • Bulk Inquiries: Contact us at pambo@5gplc.com for volume pricing or customized project quotes.
View full product details

Product Description

The 9905-971 is a high-reliability distributed I/O module developed by Woodward Inc. for the LinkNet Distributed Control Architecture. This module provides 16 discrete digital input channels for monitoring field device status in industrial automation systems.

Designed for mission-critical environments such as turbine control and power generation, the 9905-971 enables decentralized signal acquisition by moving field wiring closer to process equipment. The module communicates with the main controller via a proprietary high-speed serial LinkNet bus, significantly reducing installation complexity and improving system scalability.

The module also includes advanced latent fault detection, allowing continuous internal self-diagnostics to detect hidden electrical or logic failures before they impact control performance.

Technical Specifications

Parameter Specification
Product Line LinkNet Distributed I/O
Hardware Model 9905-971
Input Channels 16 Discrete Inputs
Nominal Input Voltage 24 VDC
Communication Interface LinkNet Proprietary Serial Bus
Isolation Optical isolation for network protection
Diagnostic Features Latent fault detection + internal health monitoring
Mounting Type DIN-rail or panel mount carrier
Housing Ruggedized industrial-grade enclosure
Net Weight 0.5 kg 

Application Scenarios

The 9905-971 is commonly used in:

  • Gas and steam turbine control systems

  • Power generation plants

  • Distributed process automation networks

  • Legacy system modernization projects

It is especially useful in facilities requiring plant-wide digital signal monitoring without rewiring centralized control cabinets.

Technical FAQ

How does latent fault detection improve reliability?
The module performs internal self-tests to ensure input detection circuits are functioning correctly, helping prevent dangerous fail-to-detect failures in safety-critical systems.

Is the module hot-swappable?
Yes, but maintenance should follow Woodward LinkNet carrier and power supply service procedures to avoid serial bus communication interruptions during replacement.