The Woodward 9905-971 is a Discrete Input Module from the Woodward 9900 Series, designed for turbine and industrial control systems. It provides 24 discrete input channels with fast update times and precise time‑stamping, enabling accurate monitoring of digital signals such as switches, relays, and alarms. Built for reliability, the module incorporates latent fault detection and flexible contact configurations, ensuring safe and efficient operation in demanding environments.
Key Features
Manufacturer: Woodward
Part Number: 9905-971
Product Type: Discrete Input Module
Number of Channels: 24 discrete inputs
Update Time: 5 ms
Time Stamping: 1 ms resolution for event logging
Input Voltage: 24 VDC per discrete input
Relay Contact Options: Supports normally open (NO) or normally closed (NC) contacts
Latent Fault Detection: Built‑in diagnostics for each relay output
Installation:
Inserted into card guides in the chassis
Secured with top and bottom screws
Equipped with extraction handles for safe removal
Country of Manufacture: United States (USA)
Availability: In Stock
Functional Role
Provides digital signal monitoring for turbine and process control systems
Detects and logs discrete events with 1 ms resolution
Ensures fault‑tolerant operation with latent fault detection
Supports flexible contact wetting voltage options (internal 24 VDC or external 18–32 VDC / 100–150 VDC)
Fully isolated inputs for safe integration with external power sources
Application Scenarios
Turbine control systems requiring precise digital input monitoring
Industrial automation for alarms, interlocks, and relay feedback
Process safety systems where event logging and fault detection are critical
Power generation plants needing reliable discrete input acquisition
FAQ
Q: How many discrete inputs does the 9905-971 support? A: It supports 24 discrete input channels.
Q: What is the time‑stamping resolution? A: Events are logged with 1 ms resolution.
Q: Can external power sources be used for contact wetting? A: Yes, external 18–32 VDC or 100–150 VDC sources can be used, with proper common connections.
