PROFINET, PROFIBUS, and IO-Link news from around the world

IO-Link: Did You Know?

Did you know that IO-Link is backward compatible with binary sensors? The IO-Link communication interface is standardized in international standard IEC 61131-9. One of the initial goals of the multi-company standardization initiative was to create an interface that takes into consideration the existing architectures and the typical connection level in the lower field level. The point-to-point connection familiar there was simply taken over in IO-Link, complete with the standard cabling.

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Is Profibus or 4-20mA More Accurate?

When it comes to transmitting process variables, 4-20 mA is by far the most popular method. Digital fieldbuses such as PROFIBUS or PROFINET, however, are said to be more accurate and generally better than 4-20 mA. What isn’t discussed very often, however, is the extent of how much more accurate they are. This topic is the elephant in the control room.

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IO-Link: Did You Know?

Did you know that over 100 members now belong to the IO-Link community? IO-Link has established itself in the market faster than almost any other communication technology. At the market launch in 2009, there were 41 member companies to start. Now with the addition of Weiss Robotics in October, the 100th company has joined the member community.

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IO-Link: Did You Know?

Did you know that IO-Link can transmit up to 32 bytes in one cycle? The IO-Link interface standardized in IEC 61131-9 is based on simple serial data transmission via conventional connecting cables. With IO-Link, it is over exactly this cable that data packets are exchanged cyclically between the IO-Link master and an IO-Link device packed in one protocol.

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Tech Tip: PROFINET Options for Devices
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Tech Tip: PROFINET Options for Devices

We often use an age old catch phrase during our PROFINET one day classes, “But wait, there’s more!” when we get to the latter part of the day. At that time we’ve usually covered the standard PROFINET application functionality and continue talking about additional PROFINET features and options. We’ve found that most engineers and developers don’t realize what the optional features of PROFINET are and their purpose. Here is a list of those optional features and what they do.

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Tech Tip: DHCP and PROFINET DCP

We often get the question: Why doesn’t PROFINET use Dynamic Host Configuration Protocol (DHCP) for IP address assignment as DCHP is used extensively in the office? Answer: DHCP could be used, optionally, but there are some differences you should know between DHCP and PROFINET DCP.

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