Invensys Foxboro: I/A Series system, FBM (field input/output module) sequence control, trapezoidal logic control, accident recall processing, DAC, input/output signal processing, data communication and processing.
Invensys Triconex: Redundant fault-tolerant control system, the most modern fault-tolerant controller based on triple modular redundancy (TMR) structure.
Westinghouse (Westinghouse): OVATION system, WDPF system, MAX1000 system spare parts.
Rockwell Allen-Bradley: Reliance Ryan, SLC 500/1747/1746, MicroLogix/1761/1763/1762/1766/1764, CompactLogix/1769/1768, Logix 5000/1756/1789/1794/1760/1788, PLC-5/1771/1785, etc.