PLCs have steadily increased their responsibility, at first replacing relay systems, then taking over process control and stepping in for motion control, according to Greg Meinert, PLC business manager for Siemens Energy and Automation. Now, by adding safety, PLCs are collapsing everything down to a single platform, Meinert says, reducing engineering, start-up and maintenance. Fail-safe CPUs execute both standard programs and safety functions. They also eliminate a need for separate safety PLCs. Read more about the company's programmable logic controllers at http://rbi.ims.ca/4915-515.
Although plastics make up only about 11% of all US municipal solid waste, many are actually more energy-dense than coal. Converting these non-recycled plastics into energy with existing technologies could reduce US coal consumption, as well as boost domestic energy reserves, says a new study.
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