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What is HART, Foundation Fieldbus & Profibus ?

S Bharadwaj Reddy
What is HART ? HART stands for ‘Highway Addressable Remote Transducer’ and is a standard originally developed as a communications protocol for control field devices operating on a 4-20 mA control signal....

What is a Fieldbus ?

S Bharadwaj Reddy
Fieldbus is a digital two-way multidrop communication link between intelligent field devices. It is a local area network dedicated to industrial automation. It replaces centralized control networks with distributed control...

Fieldbus vs 4-20mA

S Bharadwaj Reddy
The sensors and actuators that are connected to the inputs and outputs (IO) of a Programmable Controller or PLC are normally mounted in the plant. Therefore the IO connections of...

Foundation Fieldbus Tutorials

S Bharadwaj Reddy
In each tutorial different aspect of fieldbus technology, installation, and applications etc are covered. Much of the material from these tutorials is found in the following 12-Part Presentation Series. If...

Fieldbus Analog Input Function Block

S Bharadwaj Reddy
The Analog Input (AI) function block processes field device measurements and makes them available to other function blocks. The output value from the AI block is in engineering units and...

HART Protocol and Fieldbus Interview Questions

S Bharadwaj Reddy
The following are the HART Protocol and Fieldbus Interview Questions listed with answers. HART Protocol and Fieldbus Interview Questions   HART Communication Protocol (Highway Addressable Remote Transducer) 1. Define HART. HART is an...

What is a Fieldbus Terminator and How Does it Work?

S Bharadwaj Reddy
First let’s define exactly what a fieldbus terminator is. A fieldbus terminator is a component of a fieldbus system that is the equivalent of a 1 µF capacitor and a...

Difference between Fieldbus and Profibus

S Bharadwaj Reddy
The short answer is: although both “buses” are very similar, they are not the same! Here is what’s different: PROFIBUS is the overall name for a process fieldbus solution that...

Interview Questions on Fieldbus Communication

S Bharadwaj Reddy
The following are the list of interview questions on fieldbus communication Fieldbus Interview Questions and Answers Fieldbus Questions Why is the H1 bus speed 31.25kbps, not something different, suitable for closed...

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