Phoenix Contact Development and Manufacturing, Inc.

Phoenix Contact Gmbh + Co. Kg

Brenton Eugene Helfrick

Aaron Richard Kreider

Michael Colin Cherewka

Davis Mathews

David Nathan Katz

Brian Vogt

Todd Eugene Shadle

Brian James Vogt

A method for providing galvanic isolation between an input or trunk interface () and multiple outputs or spur interfaces () for connecting field devices () to a trunk () of a two-wire () process control network () includes connecting multiple sets of multiple spur interfaces to respective isolating elements (). Each isolating element () connects a respective set of outputs or spur interfaces () to the trunk interface () and galvanically isolates () the respective set of spur interfaces () from the trunk interface (). Field devices () attached to different sets of spur interfaces are also galvanically isolated from one another.

Spur isolation in a fieldbus network

A voltage limiting device for limiting the voltage being transferred from a trunk circuit to a spur circuit of a distributed control network includes an AC signal device that passes the AC data signals between the trunk circuit and the spur circuit.

Voltage limiting device for use in a distributed control system

A modular system for transmitting power and data between a control processor that receives and transmits signals along a trunk of a distributed control network, and one or more field devices located in a hazardous area includes a backplane bus and a trunk module connected to the backplane and interconnecting the trunk and backplane. Intrinsically safe spur modules are removably attached to the backplane.

Inherently safe modular control system

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Middletown, PA, United States of America

Brenton Eugene Helfrick