{"id":3952,"date":"2025-07-21T14:37:32","date_gmt":"2025-07-21T14:37:32","guid":{"rendered":"https:\/\/blog.microcontrol.net\/a-tip-from-an-expert-can-fd-vs-can-classic\/"},"modified":"2025-07-21T14:44:49","modified_gmt":"2025-07-21T14:44:49","slug":"a-tip-from-an-expert-can-fd-vs-can-classic","status":"publish","type":"post","link":"https:\/\/blog.microcontrol.net\/en\/a-tip-from-an-expert-can-fd-vs-can-classic\/","title":{"rendered":"A Tip from an Expert: CAN FD vs. CAN Classic"},"content":{"rendered":"

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A Tip from an Expert: CAN FD vs. CAN Classic –<\/span><\/h1>\n

More Speed, more Future – Time for CAN FD?<\/span><\/h1>\n

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Requirements are increasing, as are data volumes – time to switch from CAN Classic<\/strong> to CAN FD<\/strong>.<\/span><\/p>\n

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In many industrial applications CAN (Controller Area Network) <\/strong> has been the standard for decades \u2013 robust, cost-efficient and reliable. But the world is changing: machines are becoming more networked, data volumes are increasing, and response times are becoming more critical. Those who still rely on CAN Classic<\/strong> today risk reaching their limits tomorrow. <\/span><\/p>\n

The solution: CAN FD<\/strong> (Flexible Data Rate) \u2013 the logical successor that sets new standards in efficiency and speed. But why is CAN FD not yet being used consistently in many projects? And why is it no longer worth putting off the changeover? <\/span><\/p>\n

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What is CAN FD \u2013 and what is the difference to CAN Classic?<\/strong><\/span><\/h2>\n

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CAN FD was introduced in 2012 by CiA (CAN in Automation) as a further development of CAN Classic. The most important differences: <\/span><\/p>\n

\ud83d\udd39 larger user data fields<\/strong>: instead of 8 bytes, up to 64 bytes per frame<\/strong> are possible
\ud83d\udd39 higher data rates<\/strong>: up to 8 Mbit\/s<\/strong> \u2013 instead of 1 Mbit\/s with CAN Classic
\ud83d\udd39 more flexible & efficient<\/strong>: less overhead, better bus utilisation<\/span><\/p>\n

This means: more information, in less time, with the same robustness.<\/strong><\/p>\n

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Typical applicatons for CAN FD<\/span><\/h2>\n

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CAN FD is particularly useful where:<\/p>\n

\u2705 several sensors<\/strong> communicate simultaneously<\/span>
\u2705 diagnostic data or firmware updates<\/strong> are transmitted
\u2705 mobile maschinen<\/strong>, vehicles or test systems work with increasing data requirements
\u2705 a future-proof basis<\/strong> is to be created for later system expansion<\/p>\n

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Example: In modern agricultural or construction machinery, CAN FD enables the parallel data transfer of hydraulic sensors, GPS modules and engine controls – without bottlenecks in the bus.<\/span><\/p>\n

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Why many are still waiting to make the switch<\/strong><\/span><\/h2>\n

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Hesitant introduction is often due to:<\/span><\/p>\n