November/December 2020

0161 432 9995 sales@beta-power.co.uk www.beta-power.co.uk Call today for an immediate quote on ABB Motors, Drives & Softstarters We Stock We Service We Deliver 7 24 / ROBA ® -DS (steel) The worldwide number 1 supplier of power transmission products Torque Limiters 0,1 to 500,000Nm Safety Brakes 2 to 5000Nm Shaft Couplings to 110,000Nm Torque Limiters Safety Brakes Shaft Couplings 01535 663900 sales@mayr.co.uk www.mayr.co.uk ROBA-stop ® -silenzio ® EAS ® -Compact ® “Design in Mayr” 37 www.drivesncontrols.com November/December 2020 CONTROLS, HMIs AND SOFTWARE n NodeClasses, an information model can be constructed where the type definitions convey meaning and can represent entities found in the problem domain. This enables vendors and standards organisations to create a known object model that client applications and tools can be written against. Subsequently, this allows operators on the factory floor using PLCs or PAC systems, through to data scientists using big data in cloud platform for fleet-level analysis – to find the right information and present that information in the right context, at the right time. OPC UA allows servers, clients and networks to become redundant by providing services to achieve redundancy in a standardised manner. OPC UA clients need to be fault-tolerant, especially those that aggregate data from several underlying servers. To achieve this, OPC UA allows identically configured clients to work as redundant pairs. OPC UA server redundancy allows clients to obtain the same information from multiple sources. There are two modes of redundancy: transparent and non-transparent. In the first, the fail-over from one server to another does not require any actions from the client, which is unaware that the failure has occurred. In the second, the failure from one server to another requires the client to take actions to ensure continued flow of information between the client and server. Network redundancy also provides multiple paths for client and servers to communicate, thus eliminating single points of failure. Outcome optimising control (OOC) enables PAC systems to provide safe, secure communications between real- time deterministic control and non-deterministic applications. OOC uses a built-in system to support inner and outer loop control strategies (see diagram). The inherent security, platform independence, high availability and scalability combine to position OPC UA as the protocol of choice as today’s organisations focus on building out expansive IoT environments. n OPC UA allows servers, clients and networks to become redundant by providing services to achieve redundancy in a standardised manner.

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