Woodward 9905-968 Linknet Analog Input Module

Configured for multi-channel sensor signal acquisition in gas turbine control platforms, the Woodward 9905-968 (9905-968 Channel Analog Input Module) provides direct physical/electrical execution. The hardware conditions and converts 4-20 mA analog inputs from field sensors into digital data streams for processing by central governing logic. Housed in a 16 cm x 16 cm x 12 cm enclosure weighing 1.82 kg, the unit routes conditioned real-time telemetry across dedicated Linknet communication channels.

Hardware Specifications

Actuator Loop Feedback Response

The Woodward 9905-968 Linknet Analog Input Module incorporates low-latency signal filtering and digitizing logic designed to preserve actuator loop feedback response. By executing high-speed sampling across all six 4-20 mA channels, the internal circuitry scales field pressure, temperature, and position sensor inputs without phase delay. Continuous signal conditioning suppresses high-frequency electrical noise, supplying noise-free telemetry to the main controller to prevent phase lag or hunting in hydraulic actuator control loops.

Frequently Asked Questions

Q: How is signal wire shield grounding handled for the 4-20 mA input loops?

A: All 4-20 mA input loop signal cables must use individual shielded twisted pairs. Connect signal cable drain shields to the enclosure single-point grounding bus bar at one end only to prevent ground loops from introducing current measurement offsets.

Q: Can channels be hot-swapped while the Linknet network is actively processing signals?

A: Live removal or insertion of the module while powered must follow strict safety procedures. De-energize field loops or disconnect the Linknet communication header to avoid transient bus disruptions and improper diagnostic trips within the primary control software.

Field Installation Guidelines

Mount the module inside a grounded metal control cabinet using the standard mounting hardware to ensure structural stability against mechanical vibration. Wire the 4-20 mA input channels using shielded twisted-pair conductors, maintaining physical separation between low-level analog signal lines and high-voltage AC lines or inductive output wiring. Ensure the cabinet earth ground strap is bonded directly to the main grounding point with a short, low-impedance conductor prior to powering the unit.