Photo - Companies are considering upgrades for primary process control systems, but upgrades for secondary control systems can be just as important and are often easier to implement. http://www.controleng.com/single-article/upgrading-secondary-control-systems/e0362904f6532a69c216a772c8fb24b3.html

Companies are considering upgrades for primary process control systems, but upgrades for secondary control systems can be just as important and are often easier to implement. http://www.controleng.com/single-article/upgrading-secondary-control-systems/e0362904f6532a69c216a772c8fb24b3.html

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