Description
- Product Parameters
- Model Designation: WOODWARD 5501-376
- Module Type: Discrete I/O (Input/Output) Module
- System Platform: MicroNet TMR (Triple Modular Redundant)
- Discrete Inputs: 24 Channels (24 VDC)
- Discrete Outputs: 8 Channels (Configurable)
- Input Current: 2.5 mA per channel @ 24 VDC
- Output Rating: 100 mA per channel (Internal Source)
- Operating Temperature: -40°C to +70°C (-40°F to +158°F)
- Isolation: 500 Vrms to Chassis; 500 Vrms to Control Logic
- Power Consumption: 5.0 W Max
The Woodward 5501-376 is a specialized combination I/O module designed for use within the MicroNet TMR control system. It integrates 24 discrete inputs and 8 discrete outputs onto a single high-reliability card, facilitating efficient hardware mapping for turbine control and safety instrumented systems. By supporting triple modular redundancy, this module ensures that critical discrete signals—such as limit switches, pushbuttons, and solenoid drivers—are processed with the highest degree of fault tolerance and diagnostic coverage.
Distinctions from Similar Models
- Combined Functionality: Unlike the 5466-series which typically separates input and output tasks, the 5501-376 provides a hybrid 24/8 configuration, making it ideal for localized control loops with limited rack space.
- TMR Internal Voting: This module is hardware-voted within the MicroNet TMR architecture, providing higher reliability for discrete command execution than the standard Simplex or Duplex variants.
- Low-Power Optimized: The input circuitry is specifically tuned for 24 VDC nominal systems with low current draw (2.5 mA), reducing the thermal load on the control cabinet compared to older 5501 series versions.
Product Operation Guidelines
- Redundant Power Supply: Ensure the MicroNet power supply modules are balanced; a failure in the 24 VDC field power loop will disable the input sensing capabilities of this module.
- Output Load Limits: Do not exceed the 100 mA rating for individual discrete outputs; if driving high-current solenoids or large relays, use an interposing relay to prevent damage to the module’s internal solid-state switches.
- I/O Locking: In the application software (Coder or GAP), verify that the I/O locking parameters match the physical slot location to prevent configuration mismatches during system boot.
- Field Terminal Matching: Use only compatible Field Terminal Modules (FTMs) and Woodward-approved mass termination cables to ensure signal integrity and proper isolation across all 32 channels.
