InTech, January 1st, 2001
PLC CRITICAL CONTROL
Developers find that avoiding higher-level programming, while II a bit slower, is more than adequate and less costly.
Thirteen million people throughout Northern and Central California count on Pacific Gas and Electric Co. (PG&E) to deliver their energy. PG&E's parallel gas transmission pipelines, L400 and L401, carry 1.98 billion standard cubic feet of natural gas from the Oregon border to the San Francisco Bay area every day.
Four compressor stations situated strategically along the 400-mile-long pipelines boost the pressure of the gas to keep it moving down t...
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