Replacing Master and Slave Terminology In My Book

Control Geek: The racial justice protests of 2020 made me realize it was long past time to purge some offensive and obsolete language from the book. Specifically, the use of “master” and “slave” to describe control system architectures where one system has direct control over another. The roots of this book reach back to the 1990s, and I used this language because that’s what was widely used in the industry, and written in the technical standards that are the source materials for this book. But, in recent years, the technical community has become more enlightened, and so have I. So, this 2.1 update replaces that obsolete language, shifting to terms like “primary-secondary”.