Which of the following is NOT an example of a 16-bit PLC?

The CompactLogix is not a 16-bit PLC; it is actually a part of the Logix family, which primarily utilizes a 32-bit architecture. This architecture supports more advanced processing capabilities, more efficient memory usage, and enhanced features compared to older 16-bit systems.

The other options—MicroLogix, SLC 500, and PLC-5—are indeed examples of 16-bit PLCs. They utilize 16-bit processing which limits their capabilities compared to newer architectures. The MicroLogix series is designed for smaller control applications with basic PLC functions while the SLC 500 and PLC-5 systems were established platforms in industrial automation that used 16-bit technology in their operations. This foundational difference in architecture is why CompactLogix stands out as a non 16-bit option.