Product Overview
The Woodward 9905‑971 16‑Channel Discrete Input Module is a rugged industrial I/O expansion unit designed to deliver reliable acquisition of digital (discrete) signals in advanced control systems. As part of Woodward’s LinkNet‑enabled control ecosystem, this module provides sixteen independent input channels to monitor on/off status signals from sensors, switches, and protective devices. Its dependable performance, high noise immunity, and flexible mounting options make it ideal for power generation, engine automation, industrial process control, and marine systems.
Engineers choose the 9905‑971 when scalable, high‑density discrete input capacity is needed without increasing system complexity. This module integrates seamlessly with Woodward controllers and automation networks, ensuring that alarms, limit switches, fault conditions, and state changes are captured accurately and transmitted efficiently for decision‑making and system protection.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Woodward |
| Model | 9905‑971 |
| Product Type | Discrete Input Module |
| Channels | 16 independent digital inputs |
| Input Type | Logic / dry‑contact / voltage |
| Input Voltage Range | Configurable 12 / 24 V DC |
| Input Current | Low‑power digital sensing |
| Isolation | Channel‑to‑bus electrical isolation |
| Communication Interface | LinkNet digital bus |
| Supply Voltage | 12 / 24 V DC |
| Operating Voltage Range | 8 – 36 V DC |
| Mounting | DIN‑rail or panel mount |
| Operating Temperature | −20 °C to +70 °C |
| Storage Temperature | −40 °C to +85 °C |
| Dimensions | 200 mm × 110 mm × 50 mm |
| Weight | Approx. 0.50 kg |
| Housing | Industrial protective enclosure |
Application Scenarios
The 9905‑971 16‑Channel Discrete Input Module is ideal for systems that need to monitor a wide range of digital signals across an industrial control network.
Generator Protection and Control
Monitors startup/shutdown states, breaker positions, fault trips, and interlocks for generator sets.
Engine and Machine Automation
Tracks limit switches, operator panel inputs, safety gates, and status signals in production equipment.
Industrial Process Systems
Captures digital states from sensors, alarms, and equipment interlocks used in process control.
Marine and Offshore Control Systems
Collects discrete signals from propulsion and auxiliary equipment for system integration and safety functions.
Key Advantages
High Channel Density
Sixteen independent inputs allow comprehensive monitoring without additional hardware.
Flexible Digital Input Support
Handles logic, dry‑contact, and voltage‑based digital signals to meet diverse application needs.
Noise‑Immune Design
Built‑in electrical isolation and filtering help reject electrical noise and maintain signal integrity.
Seamless Integration
LinkNet communication interface enables simple connection to Woodward controllers and networks.
Industrial‑Grade Reliability
Constructed for harsh environments with a wide temperature range and durable housing.
Technical FAQs
1. What is the primary function of the 9905‑971 module?
It provides high‑density discrete input acquisition for control systems.
2. How many input channels does it support?
It supports sixteen independent discrete input channels.
3. What types of signals are accepted?
Logic level, dry‑contact, and voltage‑based digital inputs are supported.
4. What communication interface does it use?
The module interfaces through the Woodward LinkNet digital bus.
5. What voltage range does it operate within?
It operates from 8 V to 36 V DC, suitable for 12 V and 24 V systems.
6. Does the module provide isolation?
Yes, each channel is electrically isolated to protect against noise and interference.
7. In what environments can it operate?
It is suitable for industrial, power generation, engine, and marine environments.
8. What mounting options are available?
The module supports DIN‑rail and panel mounting.
9. What is the operating temperature range?
From −20 °C to +70 °C.
10. Is it compatible with Woodward controllers?
Yes, it integrates with LinkNet‑enabled Woodward control systems.
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