Excellent PLC
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Product Introduction
The Woodward 9905-971 is a rugged and reliable 16-Channel Discrete Input Module designed for high-performance signal monitoring in industrial and energy automation systems. This module is a key component within the LinkNet Distributed I/O platform, enabling real-time acquisition of digital input signals from field devices such as pushbuttons, relay contacts, limit switches, and other binary sources.
As part of the Woodward distributed control ecosystem, the 9905-971 is built to handle demanding applications in power generation, marine, transportation, and process industries. Each input is independently monitored and electrically isolated to ensure signal integrity and protection in electrically noisy environments. With easy DIN-rail mounting and LED status indicators for all channels, this module simplifies setup, troubleshooting, and expansion of complex control systems.
Product Specifications
| Parameter | Details |
|---|---|
| Model | 9905-971 |
| Product Type | 16-Channel Discrete Input Module |
| Series | LinkNet Distributed I/O Series |
| Number of Input Channels | 16 Independent Digital Inputs |
| Input Type | Dry contact or voltage (nominal 24 VDC) |
| Input Voltage Range | 0–30 VDC |
| Logic Threshold | ON ≥ 10 VDC, OFF ≤ 5 VDC |
| Input Isolation | Optical and galvanic isolation on each channel |
| Input Debounce | Software configurable per channel |
| Status Indicators | Front-panel LED for each channel |
| Update Rate | <5 milliseconds |
| Communication Interface | LinkNet over CAN or RS-485 |
| Power Supply Requirement | 18–32 VDC |
| Power Consumption | Approx. 6.5 W |
| Mounting Method | DIN Rail Mounting |
| Enclosure Type | Rugged Industrial Housing with Conformal Coating |
| Operating Temperature | –40 °C to +70 °C (–40 °F to +158 °F) |
| Storage Temperature | –55 °C to +85 °C (–67 °F to +185 °F) |
| Humidity | 5–95% RH non-condensing |
| Dimensions | 355.6 x 279.4 x 101.6 mm |
| Weight | 0.5 kg |
| Certifications | CE, UL Recognized, CSA, RoHS Compliant |
| Standards Compliance | EN 61000-6-2/4, IEC 61131, IEEE C37.90 |
Applications
The Woodward 9905-971 16-Channel Discrete Input Module is ideal for the following control system applications:
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Power Plants: Captures on/off signals from protection relays, breaker positions, and alarms.
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Turbine Control Systems: Monitors status signals such as oil pressure switches, overspeed trip devices, and permissive inputs.
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Industrial Automation: Interfaces with machine interlocks, safety devices, and operator input panels.
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Marine Control Systems: Tracks operational states of pumps, valves, and navigation-related equipment.
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Substation Automation: Collects binary input data from grid-connected systems for SCADA and HMI visualization.
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Transportation Systems: Used in rail and heavy vehicle systems to monitor digital states from auxiliary systems.
Advantages
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High-Density Input Monitoring: Offers 16 individually isolated channels in a compact footprint.
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Fast and Reliable: Sub-5 ms response time ensures accurate real-time monitoring.
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Built-In Status Indication: LED indicators for all 16 channels support intuitive diagnostics.
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Flexible Input Options: Accepts both dry contact and voltage signals for broad application use.
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Robust Construction: Engineered to perform reliably in wide temperature ranges and harsh environments.
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Safe Signal Handling: Electrical isolation prevents ground loops and protects upstream equipment.
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Seamless Integration: Fully compatible with Woodward MicroNet Plus and LinkNet systems.
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Modular Expansion: Easily expands system capabilities without complicated rewiring.
Frequently Asked Questions (FAQ)
1. What kind of signals does the 9905-971 accept?
It accepts discrete (on/off) digital signals such as dry contacts or DC voltage signals up to 30 VDC.
2. How many channels does this module support?
It supports 16 independently isolated digital input channels.
3. Can I use the module with third-party PLC systems?
Yes, it can integrate into systems via LinkNet with compatible communication interfaces like CAN or RS-485.
4. Is the module suitable for high-temperature environments?
Yes, it operates reliably from –40 °C to +70 °C, making it ideal for industrial and outdoor applications.
5. How are the inputs isolated?
Each channel is optically and galvanically isolated to ensure signal integrity and safety.
6. Does the module require configuration software?
Basic signal monitoring does not require software, but optional debounce or advanced features may be set via Woodward software tools.
7. Are LED indicators available for all channels?
Yes, each of the 16 input channels has a corresponding LED status indicator.
8. Can this be mounted in any control panel?
Yes, it supports DIN rail mounting and fits standard industrial enclosures.
9. What is the typical use of debounce functionality?
Debounce filtering is used to eliminate signal noise from mechanical switch bouncing.
10. Is the 9905-971 hot-swappable?
No, the system should be powered down before adding or removing modules to avoid damage.
Related Models from the Same Series
| Model | Description |
|---|---|
| 9905-966 | LinkNet 8-Channel Digital Output Module |
| 9905-967 | LinkNet 8-Channel Digital Input Module |
| 9905-968 | LinkNet 6-Channel Analog Output Module |
| 9905-969 | LinkNet 6-Channel Analog Input Module |
| 9905-970 | LinkNet 6-Channel Discrete Input Module |
| 9905-972 | LinkNet Expansion Base Plate |
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