The customer plant has been expanded by various service providers and has difficulties to maintain the software structure in the system parts. The replacement of the outdated, non-future-proof PTE400 library and various customer-specific blocks in a SIMATIC PCS 7 V6 version that is no longer supported was needed. In addition, the creation of up-to-date security standards for critical infrastructure was required. Siemens was commissioned as a trusted partner to provide DCS Library Services to ensure service upgradeability and optimize system availability. 

DCS Library Services as an important part of the system modernization of the central control technology: 

• Standardized library exchange of the PTE400 library and various customer-specific blocks according to APL in 54 automation systems 
• Automated revision of the user interface according to customer specifications for 6 pairs of SIMATIC PCS 7 OS servers 
• Standardization of the plant parts by creating and using typical library exchange on APL using MLFB based standard packages

Munich City Drainage is a public waste water management company. The sewage treatment plant Gut Großlappen was built in 1926 and has since been expanded by various service providers. These differ in the structure of the software in the plant sections, which leads to difficulties in the maintenance of the software.