PLCs, DCSs & Controllers


Recent trends will shape future of distributed control systems

October 2012 PLCs, DCSs & Controllers

Several trends have already impacted the distributed control systems (DCS) market and are likely to continue to do so over the next few years. These include product and technology-related trends as well as general industry trends.

More intelligent I/O

The DCS I/O subsystem is responsible for handling hundreds or often thousands of different process measurements and other inputs into the system, and outputting control signals to a large number of valves, actuators, motors and other plant final control elements. I/O represents one of the most significant parts of the DCS, and traditionally, a significant cost element. However, DCS suppliers are working to reduce both the cost and the complexity of their I/O by incorporating more intelligence and programmability into the devices.

Shift in I/O type

Fifteen years ago, the traditional process analog input came from a sensor producing a 4-20 mA analog signal and the typical analog output was a 4-20 mA signal. Discrete signals involved various combinations of voltages and currents and each type of signal had a dedicated type of circuit board.

Today, in a greenfield plant, most of the I/O supplied is on some type of bus network. Brownfield plants are also installing more bus I/O, however, with the large installed base of traditional 4-20 mA I/O, the transition is very slow. Major expansions or revamps in brownfield plants consider bus I/O when the sensors and final control elements are also part of the project.

There is also a growing trend towards adding more wireless I/O and associated field devices, particularly for process and equipment monitoring applications.

Need for network consulting services

As the lines between automation and IT begin to blur with increased use of commercial off-the-shelf (COTS) technology, the network infrastructure of the DCS and the network architecture for plant information become increasingly intertwined. End users now often rely on the expertise of suppliers for consulting to set up these networks in a safe and secure manner.

Virtualisation

DCS suppliers started incorporated server virtualisation a few years ago. Common uses of this technology include engineering development and for simulating automation in training. Virtualisation is not appropriate for all parts of the DCS. Sometimes, dedicated hardware will perform a given task better than a virtual server. A good example is the real-time process controller in a DCS, where speed, determinism and high reliability are major design considerations for the operation and safety of the plant. On the other hand, a virtual server performing many applications on one box can be a good choice for offline applications such as control configuration, simulations, and training.

Cyber security

With todays more open and interoperable, largely COTS-based automation systems, cyber security is becoming more important as end users struggle with potential risks, both internal and external to the DCS. Most suppliers now address this threat with active programs, either in house or through partnerships. As part of a ‘defence-in-depth’ cyber-security strategy, network firewalls and strategically placed switches are required to help prevent the propagation of external viruses and intrusions. Internal threats from disgruntled employees or other internal access points must be addressed with such things as USB locks and software to monitor internal automation system network activity. Furthermore, network maintenance practices that are common in the IT world – such as automatic software updates, anti-virus updates, and bug fixes – must be modified for the mission-critical, 24/7 industrial environments in which DCSs typically operate.

Mobility

Just as people today find it hard to live without their smartphones in their daily lives, increasingly, process operators and production supervisors are relying on the ability to ‘access data anywhere, anytime’ to perform their job functions. DCS suppliers address this trend by supplying tablet technology for roving operators and use of smartphones for alerts and condition monitoring. This trend towards increasing mobility will grow in importance in the coming years.

Cloud computing

There has been much talk in the industry about developments underway to move selected DCS applications ‘to the cloud’, a reference to moving applications to remote, Internet (public) or intranet (private) based servers. However, the control automation industry is very conservative by nature, and for the time being this is just talk. ARC believes that, ultimately, selected DCS applications are likely to move to private, and in some cases, even public clouds, but

for now, end users are wary.

Modular skid-mounted DCS

More process units these days are being built and delivered on skids (engineered to order and ready to plug into the process flow), rather than built in situ. As a result, DCSs are showing up on skids when they arrive at the plant or mill, unless there has been good coordination upfront between the equipment supplier and the user’s automation team, the skid-mounted DCS technology can be different than the desired system for the plant. Heterogeneous DCS solutions require additional communication interfaces and significant increases in engineering services. This issue could be avoided altogether by the automation team standardising on one DCS supplier early in the project and requiring all skid vendors to supply the same type of DCS.

For more information contact Paul Miller, ARC Advisory Group, +1 781 471 1126, pmiller@arcweb.com, www.arcweb.com





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