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ResultsThe initial migration in 1999 began with the installation of the CENTUM CS 3000 R2 DCS for the new production line. Following the startup of the new line, work commenced on migrating the plant’s original production line from a third party control system to the new DCS. This was accomplished with a minimum of plant downtime. By spring 2001, the CENTUM DCS comprised 13 FCSs, 23 HISs (including two EWSs), and a total of 9,900 I/Os. A subsequent upgrade in 2004/2005 introduced the latest HIS PC hardware and software and was implemented in a highly systematic way so as to allow for easy maintenance. In 2006, the DCS was expanded by another 2,500 I/Os and four more FCSs, and a new Vnet/IP bus segment was introduced. Modifications undertaken in spring 2007 mainly focused on the replacement and upgrade of six HISs that had been used for archiving purposes. The system currently has a total of 21 FCSs and 13,000 I/Os and relies exclusively on CENTUM CS 3000 R3 and Windows XP.Customer SatisfactionDr. Jürgen Mosler, Head of Technical Operations at Stockhausen, explains why Yokogawa was selected as DCS provider: “In 1999, we were looking for a competent partner who, on the one hand, could reliably deal with the migration of the old DCS, and, on the other hand, provide a new system with a convincing concept for future adaption and expansion. This is why we decided to go for Yokogawa.”Dr. Mosler is also highly content with the subsequent migration steps: “In 2005, we could perform the release upgrade without any shutdown at all. All the FCSs just continued to operate, making this upgrade a very simple and cost-efficient procedure. In 2006, we opted for the Vnet/IP implementation although our V net installation had not yet reached its limits. This was in order to ensure a maximum of flexibility also for the future.”Fig.1 Major migration phases for the CENTUM systemSuccess Story Collection14Stockhausen GmbH / Germany

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