Similar to distributed control, distributed safety is coming soon to a process plant near you--maybe even your own. Control's cover story for May, "Distributed Safety Arrives," explores how users are handling its emergence. This issue's second feature, "IEC 61131-3 by the Numbers" defines what the PLC open standard for controllers is, what it is not, and its benefits.
Next, our story "Meditating on Disturbance Dynamics," reports that managing control loops requires a deep understanding of setpoint, load path and noise. Also, this month's "Lessons Learned" column examines what went wrong at the Fukushima nuclear power plant in the wake of Japan's recent tsunami; and, in their "Control Talk" column, McMillan and Weiner look at some extraordinary PID innovations.