9905-972 LinkNet Module | Woodward 6-Channel Analog Output

Product Overview

The Woodward LinkNet 9905-972 is a high-reliability 6-Channel Analog Output (4–20 mA) I/O Controller Node designed for distributed turbine and engine control architectures. As part of the Woodward LinkNet family, this module enables MicroNet and NetCon control systems to interface directly with field-actuated devices, control valves, positioners, and external indicators over standard 4–20 mA current loops. Operating as a networked I/O node, the 9905-972 offloads signal-processing tasks, reduces field wiring complexity, and ensures fast, deterministic command execution. Built with a rugged enclosure for demanding industrial environments, the module features an approximate shipping weight of 0.45 kg (1.0 lbs) and delivers precise dynamic response across operating temperatures from 0°C to 55°C.

Technical Specifications

Key Hardware & Operational Features

• Distributed I/O Architecture: Mounts near field actuators to convert high-speed LinkNet serial bus commands into 6 accurate 4–20 mA current signals, drastically reducing long multi-pair wiring runs.
• High-Precision Actuator Control: Provides smooth, high-resolution current driving capabilities optimized for critical steam, gas, and hydro turbine control valves.
• Fault-Tolerant Network Integration: Fully compatible with Woodward MicroNet control systems, featuring automated node health reporting and loop fault detection.
• Industrial Standard Compliance: Engineered with optical isolation and heavy-duty noise immunity to withstand harsh electromagnetic interference (EMI) typical in power generation sites.

Installation & Field Wiring Guidelines

1. Unit Mounting: Snap the LinkNet node onto a standard DIN rail inside the control cabinet or local field junction box.

2. Network & Power Wiring: Connect the LinkNet network communication cable and power supply wires to the labeled terminal blocks on the module base.

3. Channel Wiring: Wire external field devices (actuators, valves, positioners) to the 6 analog output channels using shielded twisted-pair 4–20 mA loop cables.

Frequently Asked Questions (FAQs)

Q1: What is the main function of the Woodward 9905-972 node?
A1: It acts as a distributed I/O controller node converting LinkNet network commands into 6 isolated 4–20 mA analog outputs.

Q2: What controllers are compatible with the LinkNet 9905-972?
A2: It interfaces directly with Woodward MicroNet and NetCon control platforms over the LinkNet communications network.

Q3: What field devices can be driven by this module?
A3: It is designed to drive 4–20 mA industrial actuators, electro-hydraulic valve positioners, variable frequency drive references, and remote meters.