AutoQuiz is edited by Joel Don, ISA's social media community manager.

This automation industry quiz question comes from the ISA Certified Automation Professional (CAP) certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional's skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for more information about the CAP program.

In the post image, which H1 Level Fieldbus topology reflects a "Tree Topology"?

a) Topology A
b) Topology B
c) Topology C
d) Topology D
e) none of the above

Tree Topology concentrates the connection of several field devices to couplers/junction boxes. Tree topology is also known as "Chickenfoot" or "Star" configuration.

a) End-to-End Topology, is used to directly connect two devices. The connection may be entirely located in the field (a transmitter and a valve with no other devices connected) or to connect a field device (a transmitter) to the Host Device.

b) Bus with Spurs Topology, uses a single bus to which devices and spurs are directly connected. Several devices may be connected to each spur. The total spur length is limited according to the number of spurs and the number of devices per spur.

c) Point-to-Point (or Daisy Chain) Topology, has all devices used in the application connected in series. The Fieldbus trunk is routed from one device to the next, being interconnected to the terminals of each Fieldbus device.

The correct answer is C.

Reference: Foundation Fieldbus, Fourth Edition by Ian Verhappen, CAP, P.E., and Augusto Pereira.

About the Editor
Joel Don is the community manager for ISA and is an independent content marketing, social media and public relations consultant. Prior to his work in marketing and PR, Joel served as an editor for regional newspapers and national magazines throughout the U.S. He earned a master's degree from the Medill School at Northwestern University with a focus on science, engineering and biomedical marketing communications, and a bachelor of science degree from UC San Diego.

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