Danetta York, marketing specialist, ProSoft Technology Inc. (Bakersfield, Calif.) and Gary A. Mintchell, senior editor

Articles

Control Systems January 1, 2001

Modbus modules still connect

Every day, nearly 750,000 barrels of crude oil and refined products flow through 16 U.S. pipelines owned by Conoco Oil (Houston, Tex.). In 1994 Conoco Oil evaluated its legacy system and didn't like what was there. The circa-1978 centralized control system used multidrop, leased telephone lines.

By Danetta York, marketing specialist, ProSoft Technology Inc. (Bakersfield, Calif.) and Gary A. Mintchell, senior editor