SOURCE: Semaphore


April 15, 2011 10:30 ET

Semaphore Brief Describes Implementation of Redundancy in Ethernet IP SCADA Networks

LAKE MARY, FL--(Marketwire - Apr 15, 2011) - Semaphore, a CSE Global company, has released a technical document with information on implementation of redundancy in Ethernet IP SCADA networks.

The "Virtual Router Redundancy Protocol (VRRP) in Semaphore's Kingfisher RTU" brief describes how VRRP eliminates a single point of failure in an industrial network.

The Virtual Router Redundancy Protocol (VRRP) is a broadcast and election protocol that provides redundancy between network routers. Using this protocol, multiple network routers may have availability and priority of a single network router to respond to one or more IP addresses. Where a network router with a higher assigned priority for VRRP operations is present on the network, it may announce its presence and subsequently configure and respond to the one or more IP addresses associated with VRRP operations. In this manner, multiple network routers can be employed to provide network services, such as the selective redirection or re-transmission of communications between network segments, associated with one or more IP addresses.

The document is available on the Semaphore website,

The Kingfisher RTU series is based on an advanced, automation technology platform for SCADA system applications. Kingfisher is the only RTU line that features an embedded programming environment that is compliant with both IEC 61131-3 and 61499 as well as an enhanced DNP3 protocol suite, security platform, complete array of communications networks and advanced functionality including redundancy.

The contemporary Kingfisher product line includes the Kingfisher Plus+ and G30 models. Kingfisher Plus+ is an advanced, modular RTU that offers expansion up to 1000 I/O points. The G30 is a compact RTU that extends the full capabilities of Semaphore's Kingfisher Plus product line to small SCADA system applications requiring up to 32 I/O points.

Semaphore's T-BOX and Kingfisher RTU products are ideal for a broad range of monitoring and control applications in the broadcast / telecom, infrastructure management, oil & gas, power, transportation and water / wastewater industries. For more information about Semaphore solutions, visit, or contact Semaphore at 1200 Chantry Place, Lake Mary, FL 32746, 407-333-3235.

About Semaphore

Established in 2006, Semaphore was the result of a merger of two CSE Global companies, RTUnet, of Australia, and TechnoTrade SA, of Belgium. For over 20 years, these companies have provided leading solutions for telemetry, automation, and remote monitoring and have an installed base of more than 70,000 devices. For more information, visit

Semaphore is a wholly owned subsidiary of CSE Global, a worldwide technologies provider in the industrial automation, telecommunications, environmental and healthcare markets. Headquartered in Singapore, it has more than 1500 qualified and technical staff operating a network of over 30 offices in 20 countries, spanning the Americas, Asia Pacific, Europe, Middle East and Africa. Its truly international business landscape is reflected by the fact that more than 90% of annual revenue is derived from outside Singapore. For more information, visit

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