Product Overview

The Woodward 9905-971 Rev(K) is a high-density discrete input interface module used within the MicroNet control system architecture. It converts signals from field devices such as switches and auxiliary contacts into digital data for processing by the control CPU.
This module supports 24 independent input channels and is supplied as 100% brand new original equipment, incorporating Rev(K) hardware improvements for enhanced signal integrity and long-term operational stability.

Technical Specifications

Engineering Advantages

• High-Resolution SOE Logging: 1 ms timestamping enables precise event reconstruction for turbine trip and fault analysis.

• Latent Fault Detection: Continuously monitors relay integrity to detect hidden wiring or contact failures.

• Improved Maintainability: Extraction handles simplify installation/removal and reduce risk of connector damage.

• Noise Immunity: Opto-isolated inputs protect against electrical transients and interference in harsh environments.

• Flexible Wiring: Supports both NO and NC contacts, reducing the need for external interface components.

FAQs

Can it accept AC input signals?
No. The 9905-971 Rev(K) is designed for 24 VDC inputs. AC signals require external conditioning or dedicated modules.

Does it require calibration?
No. As a digital input module, it operates on binary states and does not require calibration.

What improvements does Rev(K) provide?
Rev(K) includes updated components and improved mechanical/electrical robustness for better long-term reliability under vibration.

What is the product condition?
This unit is supplied as 100% brand new original equipment, with factory packaging and no prior use.