PROCESS CONTROL SYSTEMS
DCS MOVES WITH THE TIMES Control Engineering Europe reports on changing DCS technology which is being adapted to meet the need for more agile production.
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n the past making a process control choice might have tied a company into the same distributed control system (DCS) technology solution for decades. The scalability and flexibility of traditional DCS systems meant that customers needed to engage for long periods to ensure proper return on investment (ROI) of an often significant investment and this would tie them into a solution. Offering an explanation of why some companies had no choice but to do this, Alain Hermans, process control program manager, EMEA at Rockwell Automation, points out that, in the past the use of PLC/SCADA solutions were not recommended for use in heavy industries, so for many a DCS was the only solution. “More recently, with the globalisation of consumer markets there is a growing need for increased production flexibility, alongside CAPEX/OPEX reductions,” said Hermans, and this has resulted in the creation of more scalable and open control systems solutions. “We are seeing cycles getting shorter and this is driving customers to manage
their plant/asset lifecycle in a more proactive manner,” continued Hermans. “To reduce the risk of production losses due to obsolescence, manufacturers and processors are now planning migration budgets as part of their business plans.” The NAMUR specifications are helping achieve this as they have lessened the need to commit to a single vendor’s control technology, thanks to the MTP (Module Type Package) standards, which demand a vendor neutral and functional description of the process module automation that can be generated by the engineering tool of the module. So, going forward, how can engineers ensure that their process control assets are future-proofed and have greater flexibility? Hermans believes that the industry is driving towards greater standardisation throughout multiple plants and process skids and there is a need to allow the engineering community to quickly adjust systems and add process equipment or modify the DCS system to meet production changes. Helping to achieve such production flexibility requires an open system which
comes with process functionality that enables high levels of standardisation, but without limiting the engineers to adopt the system to the application requirements or future integration of new process equipment. High-end analytics and augmented reality (AR) are also useful tools that can be added into today’s process control offerings to enable process engineers to review plant functionality before it is created physically, and to give valuable insight into production processes to allow changes to be made to ensure productivity is always maximised.
An ideal world In an idea world control engineers simply want their control systems to work and to be available 24/7/365. They don’t want to build, integrate, troubleshoot and maintain their automation; they want it to just work. Sean Sims, vice president of DeltaV platform marketing at Emerson, believes that technology alone is not the answer to more flexible and efficient production. He said: “A strong partnership between customer and
Smoothing the upgrade path Yokogawa released its CENTUM distributed control system (DCS) in 1975 and CENTUM VP is now the ninth generation of the series. The latest enhancements to the system – offered with CENTRUM VP R6.08 – are designed to reduce the amount of work needed to upgrade a control system’s CPU module, including a newly developed utility kit and standards certification for individual CPU modules. This new version also enhances a function that allows for system upgrades without interrupting the process control. Providing a smooth upgrade process will help users achieve long-term stability in their plant operations and enable the efficient utilisation of assets. It is now possible to undertake CPU module upgrades without needing to replace the cabinet that houses these components. Yokogawa has developed a utility kit that
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eliminates the need to replace the cabinet when upgrading the CPU module. This can help reduce workloads, prevents waste, and lowers the barriers to the introduction of new technology. Other enhancements have been made to the online upgrade capability of the system for batch processing operations. CENTUM VP R6.05, which was released in 2017, included the first online upgrade function that eliminated the need to halt a plant to perform such upgrades, and gradual improvements have been made to enable a wider range of applications. With version R6.08, this online upgrade function has been enhanced with the addition of support for SEBOL, the principal programming language for batch processing sequence control.
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