Executive Summary
Westinghouse continues to evolve the proven Common Q safety platform under the Common Q+ (CQ+) modernization strategy - preserving licensing foundations while enabling phased upgrades aligned with long-term operation needs. The PM646C processor module addresses component obsolescence and increases computing capacity while maintaining compatibility with the existing Common Q system architecture.
As part of the CQ+ integrated safety system platform story, PM646C provides a drop-in modernization path for existing Common Q processors -supporting lifecycle extension and upgrade planning without forcing disruptive rip-and-replace changes.
PM646C Processor Module
Modernized processor technology that mitigates obsolescence risk and increases computing capacity - while preserving the Common Q application and I/O architecture.
Key Features & Capabilities – PM646C
- Higher performance processing to increase capacity while maintaining deterministic behavior.
- Backward compatible with existing Common Q applications, AC160 I/O, and communication cards—supporting upgrade planning without rework.
- Four high‑speed serial link ports to expand connectivity options within the Common Q architecture.
- Supports simplex or redundant configurations to match system availability requirements.
- Fault‑tolerant memory design to support robust operation in safety applications.
- Enhanced diagnostics to improve troubleshooting and reduce time to restore.
- Fault-tolerant onboard memory to support robust operation in safety applications.
- Communications expansion option via a daughter card interface to enable additional protocols for test and future applications.
Common Q+ Delivers Interconnectivity and Operability
New Features
- Multi-core processors
- Reuses source code and functions for compatibility
- Four HSL links
- Fault tolerant onboard RAM
- Enhanced diagnostics
Customer Benefits
- Mitigates processor obsolescence risk while protecting existing Common Q investments.
- Supports phased modernization planning as part of the CQ+ integrated safety system roadmap.
- Improves troubleshooting efficiency and reduces time to restore with enhanced diagnostics.
- Maintains compatibility with the existing Common Q system architecture to minimize implementation disruption.
Why Westinghouse
- Largest global deployment of safety platforms
- Comprehensive lifecycle management commitment
- Proven global delivery track record across AP1000, APR1400, OPR1000 and multiple upgrade programs
- Single accountable partner for architecture, licensing, deployment, and long-term modernization
