Fieldbus Foundation Announces First Registered Isolated Device Couplers

The Fieldbus Foundation has announced registration of the first isolated device couplers based on its Foundation H1 (31.25 kbit/s) device coupler test specification. Devices from MTL and R. Stahl successfully completed the foundation’s rigorous registration process.

As part of a Foundation fieldbus infrastructure, isolated device couplers are installed where the fieldbus trunk (i.e., home run cable) is connected to the various device spurs. Isolated device couplers are specifically designed to allow automation end users to connect more devices per coupler while permitting live segment work in hazardous plant areas. These couplers provide isolated, conditioned power to multiple fieldbus devices and protect against short circuits caused by excess current in a spur. By enabling more devices per segment, they also help reduce controller input/output (I/O) points and associated installation costs.

MTL’s 9370-FB Series Fieldbus Barrier provides a range of complete integrated enclosure systems, instead of stand-alone barrier modules. All internal components are live pluggable, meaning that field maintenance can be carried out quickly and safely. Surge protection devices for the trunk and spurs can be easily fitted without requiring product re-design. The product series includes 6- and 12-spur versions in stainless steel or GRP enclosures, as well as a redundant option enabling improved system availability in critical fieldbus networks.

MTL’s 9370-FB Series Fieldbus Barrier

R. Stahl’s Series 9411/21 and 9411/24 isolated device couplers are suitable for use in Zone 1, Zone 2 and U.S. Division 2, and are available with plastic or stainless steel housings that can be tailored to fit customer requirements. The series also includes a unique power management feature: during the start-up of a fieldbus segment, the spurs energize one after the other. This reduces the inrush current on a segment by up to 50 percent, requiring less spare energy and making longer segment lengths possible.

R. Stahl’s Series 9411/21 and 9411/24 Isolated Device Couplers

About FieldComm Group

The FieldComm Group is a global standards-based organization consisting of leading process end users, manufacturers, universities and research organizations that work together to direct the development, incorporation and implementation of new and overlapping technologies and serves as the source for FDI technology. The FieldComm Group’s mission is to develop, manage and promote global standards for integrating digital devices into automation system architectures while protecting process-automation investments in HART and FOUNDATION Fieldbus communication technologies. Membership is open to anyone interested in the use of the technologies. For more information, visit their web site at www.fieldcommgroup.org.

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