Description
- The WOODWARD 5466-258 is a high-performance central processing unit (CPU) module specifically designed for use in Woodward MicroNet Triple Modular Redundant (TMR) control systems. This module serves as the primary intelligence for large-scale prime mover control, such as gas and steam turbines, where system availability and safety are paramount. It utilizes a robust microprocessor architecture to execute complex control algorithms and manage high-speed I/O communication across the VME backplane. Engineered for the most demanding industrial environments, the 5466-258 provides the deterministic performance and fault-tolerant logic necessary to ensure zero-downtime operation in power generation and mechanical drive applications.
Product Parameters
- Brand: Woodward
- Model Number: 5466-258
- Module Type: Main CPU / Processor Module
- System Architecture: MicroNet TMR / Simplex
- Microprocessor: Motorola PowerPC series (High-clock variant)
- Memory: Integrated Flash and DRAM for firmware and real-time application code
- Communication Ports: Ethernet (RJ45) and Serial (RS-232/RS-485)
- Input Voltage: +5 VDC (Supplied via MicroNet backplane)
- Redundancy Support: Hardware-based “two-out-of-three” voting synchronization
- Operating Temperature: 0°C to +55°C
- Indicators: LED Status for Run, Fault, and Network activity
This module acts as the central coordinator within a TMR rack, processing input signals from various sensor modules and outputting precise actuator commands while cross-checking data with redundant CPU modules to eliminate single points of failure.
Comparison with Similar Models
The 5466-258 is a more advanced version of the 5466-411 or 5466-409 CPUs, offering significantly improved Ethernet connectivity and processing bandwidth. While older models relied heavily on serial interfaces for HMI communication, the 5466-258 integrates high-speed Ethernet ports, allowing for faster data logging and seamless integration with modern plant networks. Unlike the simplex-only CPU versions, this module contains the specialized synchronization hardware required for TMR operation, making it suitable for SIL-3 safety applications where the older, lower-spec processors might face performance bottlenecks.
Operation Tips
- Ethernet Configuration: When setting the IP address for the first time, ensure the module’s subnet mask is correctly aligned with the plant’s control network to avoid communication collisions with other redundant CPUs.
- Firmware Consistency: In a TMR configuration, it is critical that all three CPU slots contain the exact same firmware version and application code; even minor discrepancies can cause a “Miscompare” fault and disable redundancy.
- Hot-Swap Protocol: Although the MicroNet system supports hot-swapping, you should only remove a 5466-258 module when the remaining two CPUs are healthy and “In-Sync” to prevent an accidental system trip.
- ESD Precautions: This module uses high-density CMOS components; always use a grounded wrist strap and an anti-static mat during handling to prevent latent damage to the PowerPC processor.
