PLC and DCS
PLC is an industrial computer used to control manufacturing processes such as robotics, high speed packaging, bottling and motion control. Over the past 20 years, PLCS have added more features and created more benefits for small factories and installations. PLC is usually a stand-alone system, but can also be integrated with other systems, through communication to achieve the connection between each other. Since each PLC has its own database, integration requires some degree of mapping between controllers. This makes the PLC especially suitable for small applications that do not require much extension.
DCS, on the other hand, decentralizes the controllers in the automation system and provides common interfaces, advanced controls, system-level databases, and easily Shared information. Traditionally, DCS has been used primarily in process processes and in larger plants, where large system applications are easier to maintain throughout the life of the plant.
PLC and DCS systems are generally suitable for discrete and process manufacturing respectively. Discrete manufacturing facilities using PLC systems, generally composed of separate production units, are mainly used to complete the assembly of components, such as labeling, filling or grinding. Process manufacturing facilities, often using automated systems, are produced in a continuous and batch manner by recipe rather than by piece. Large continuous processing equipment, such as oil refineries and chemical plants, use DCS automation systems. Hybrid applications usually use both PLC and DCS systems. Selecting a controller for an application takes into account the size of the process, scalability and future update plans, integration requirements, functionality, high availability, and return on investment over the life of the factory facility, among other factors.
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PLC : Allen Bradley, GE FANUC , Schneider
DCS : ABB , Siemens MOORE , Foxboro , Westinghouse , YOKOGAWA
ESD : Triconex , HIMA , Bently Nevada , ICS Triplex
Excitation cards : ABB , GE Marke