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9905-971

Woodward 9905-971 Discrete Input Module | 24 Channels

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  • Manufacturer: Woodward

  • Product No.: 9905-971

  • Product Type: Discrete Input Module

  • Product Origin: USA

  • Payment:T/T, Western Union

  • Weight: 450g

  • Shipping port: Xiamen

  • Warranty: 12 months

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Woodward 9905-971 Technical Overview

The Woodward 9905-971 is an industrial-grade Discrete Input Module designed by Woodward for critical control systems. Featuring a lightweight construction of approximately 0.45 kg (1.0 lbs), it accepts up to 24 contact inputs operating at 24 VDC wetting voltage with a fast 5 ms update time and 1 ms time-stamping resolution. Built with latent fault detection across its relay outputs, this module disengages safely via front-panel ejector handles and secures directly into the control chassis motherboard.

Part Number Breakdown

  • 9905: Woodward Control Hardware & I/O Module Series
  • -971: Specific Model Designator — 24-Channel 24 VDC Discrete Input Transducer Board

Technical Specifications Table

Parameter Specification
Manufacturer / Brand Woodward
Full Part Number 9905-971
Product Type Discrete Input Module
Number of Channels 24 Channels (4 Modules / 6 Contact Inputs per Module)
Discrete Input Voltage 24 VDC Nominal Contact Wetting Voltage
External Power Options 18–32 VDC or 100–150 VDC External Source
Performance Resolution 5 ms Update Time / 1 ms Time Stamping Resolution
Fault Detection System Latent Fault Detection (Series-Parallel Relay Readback)
Physical Weight Approx. 0.45 kg (1.0 lbs) Standard Module Weight
Mounting & Hardware Chassis Card Guides / Motherboard Connectors with Top & Bottom Retaining Screws
Country of Manufacture United States (USA)

Key Features & Hardware Configurations

Features 24 isolated inputs, 24VDC wetting, latent fault relay detection, 0.45 kg weight, 5ms update time, and USA origin.

Frequently Asked Questions (FAQs)

Q1: What are the main specs of the Woodward 9905-971 module?
A1: 24 discrete channels, 24 VDC input voltage, 5 ms update time, 1 ms time-stamping, and 0.45 kg weight.

Q2: How does latent fault detection work on this module?
A2: It uses a series-parallel relay configuration with readback circuitry to test relays without altering output state.

Q3: How is contact wetting power provided to the discrete inputs?
A3: Power can be sourced internally (via terminal jumpers 33–35) or externally via 18–32 VDC / 100–150 VDC.

🏷️ Tags: Discrete Input Module Woodward

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