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Full redundancy for smart wireless control applications

05 January 2010

Emerson has announced an approach to redundancy for Smart Wireless monitoring and control solutions. Available with the DeltaV S-series digital automation system, full redundancy protects the wireless network from any single point of failure by allowing primary failover to ensure that data is always delivered even if there is a malfunction.

Full redundancy for Smart Wireless monitoring and control applications
Full redundancy for Smart Wireless monitoring and control applications

The enhancements include redundant Wireless I/O, power and communications and a redundant Smart Wireless Remote Link. The Remote Link can be mounted in class 1/Div 1/zone 0; it easily links the wireless field network into a DeltaV system which makes an optimised PID available for wireless control. The new full redundancy increases the strength of Smart Wireless technology as a complement to wired and bus approaches on capital projects.

Thousands of Smart Wireless installations are successfully operating globally in demanding environments industry-wide. The new wireless network redundancy and robustness enables customers to now confidently extend use to critical monitoring and control applications with the same flexibility and ease of use of the entire Smart Wireless platform.

Smart Wireless is based on the WirelessHART standard, which is designed for control and monitoring applications. Smart Wireless devices based on the WirelessHART standard deliver 99.9% reliability because of the self-organising nature of the network. This ensures that data is always delivered reliably and is never lost. This level of reliability is a prerequisite to using wireless technology for any critical monitoring or control application. Devices that conform to the WirelessHART specification can sense measurements at update rates up to once per second.

WirelessHART also allows exception reporting for network efficiency; devices only communicate a measurement value if it has changed significantly since the last communication or if the time since the last communication has exceeded a required reporting time, optimising battery life.

Two recent installations have demonstrated the effectiveness of Smart Wireless for control over WirelessHART networks. At bioprocess technologies supplier Broadley James, WirelessHART pH and temperature transmitters control a single-use disposable bioreactor.

Both installations use an enhanced PID algorithm available with the DeltaV S-series. This PID algorithm for wireless devices delivers high accuracy control in an exception reporting environment. It is a perfect complement to maximise control performance with wireless technology.

In addition to the new redundancy capability, Emerson offers a wide range of wireless field instrumentation and plant operations equipment, including Emerson Smart Wireless Gateways with redundancy, THUM adapter, Fisher position monitors, Rosemount transmitters, Rosemount Analytical and Machinery Health Management devices, and native wireless interfaces to AMS Suite predictive maintenance software, DeltaV and Ovation digital automation systems, and wireless SmartStart Services. Smart Wireless is an extension of Emerson’s PlantWeb digital plant architecture.

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