Reader Feedback: Ask the right question about industrial communications

Ethernet technology can solve fieldbus problems.

ethernet NAV

I know you are not a networking expert, but I am. I found it difficult to read your cover article for the November 2016 edition. Let me explain. Ethernet is a communications technology widely used to solve problems in industrial Fieldbus communications. Let me illustrate—EtherNet/IP, Profinet, PowerLink, EtherCAT, Sercos III, Foundation Fieldbus HSE and CC-Link IE are all fieldbuses and use Ethernet technology at layers 1 and 2 (physical and data link layer). Why do I say they are fieldbuses? They are all in the International Electrotechnical Committee (IEC) Standard 61158 that defines industrial fieldbuses. Each has different ways to use Ethernet, but none of them…

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How to tune PID loops

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Control Design December 2016 CoverControl Design is the only industrial automation magazine dedicated to the automation information needs of industrial machine builders. Browse the magazine archive

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How to decide between PNP and NPN

What signal level sensors and I/O modules should you standardize on?

By Mike Bacidore, editor in chief

A Control Design reader writes: My question arises due to machines we received at our manufacturing plant in Arizona from an OEM in Asia. All of the PLC 24 Vdc digital input modules were NPN (sourcing 24 V dc) and our plant’s standard is PNP inputs (sinking 24 Vdc inputs). These signal levels…

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