Abstract
Industrial controls, and in particular, Programmable Logic controllers (PLC) currently form an important technological basis for the automation of industrial processes. Even in the age of industry 4.0 and industrial internet, it can be assumed that these controllers will continue to be required to a considerable extent for the production of tomorrow. However, the controllers must fulfill a range of additional requirements, resulting from the new production conditions. Thereby, the introduction of the service paradigm plays an important role. This paper presents the concept of smart industrial control services (SICS) as a new type of a PLC. As a distributed service-oriented control system in an IP network, a SICS controller can replace the traditional PLC for applications with uncritical timing in terms of Industry 4.0. The SICS are programmed as usual in industry, according to the standard IEC 61131-3, and run in a SICS runtime on a server or in a cloud. The term Smart Service is introduced and the uses of SICS as a smart service, including a clearing system for the creation of new business models based on control as a service, are described. As a result, two different SICS prototype implementations are described and two application examples from manufacturing automation, as well as the evaluation of the real-time features and the engineering of a SICS controller, are discussed in the paper.
Highlights
Industrial controls, and in particular, Programmable Logic controllers (PLC) controllers currently form an important technological basis for the automation of industrial processes
Mode are considered in in more more detail, since these could be suitable for future control applications
Using the concept of smart industrial control services, a new type of industrial control was developed and tested that allows for the complete detachment of control function and associated equipment to globally distributed, cloud-based software control services
Summary
Industrial controls, and in particular, PLC controllers currently form an important technological basis for the automation of industrial processes. A series of I40 requirements are placed on the future controllers used in these systems. Based on the I40 requirement for the service capability of an I40 controller, some projects [3,4] are involved with the integration of service functions in PLC controllers. Web Services (DPWS) enables, as standardized protocol, service-based access to PLC controllers [5]. The DPWS solutions have a principle disadvantage: Instead of reducing or removing the information encapsulation (I40 requirement), further functionalities (service functions) are encapsulated in the controller. The attainable transmission time of process data via a global network, tend to be in the upper range.
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