Can 2.0 Vs. Can Fd | Dorleco

Can 2.0 Vs. Can Fd: The Evolution of Controller Area Network


The Controller Area Network, or CAN, has long been the preferred protocol for transferring data between electronic control units (ECUs) in the world of automotive and industrial communication systems. This technology has advanced over time to satisfy the rising demands of contemporary cars and industrial automation. The change from CAN 2.0 (Controller Area Network 2.0) to CAN FD (CAN with Flexible Data Rate) is a crucial turning point in this history.

In this blog post, we will examine the distinctions between CAN 2.0 and CAN FD, as well as the benefits it offers in terms of data speed, dependability, and adaptability. We will also examine the factors that led to this move.

1. Understanding CAN 2.0:

For many years, the industrial and automotive sectors’ go-to communication protocols have been Controller Area Network 2.0, often known as Classical CAN. CAN 2.0 was created by Bosch in the 1980s with the intended goal of facilitating communication amongst automobile ECUs. It was appropriate for situations where security and real-time data sharing were crucial since it provided a dependable and deterministic communication channel.

Can 2.0 Vs. Can Fd | Dorleco
Can 2.0 Vs. Can Fd | Dorleco

2. Key Features of CAN 2.0:

  • Fixed Data Rate: The fixed data rate of CAN 2.0 is arguably its biggest drawback. It runs at a top speed of 1 Mbps, which was adequate for early industrial and automotive applications but has since become a bottleneck as data requirements have grown over time.
  •  Message Length: The maximum message length allowed by CAN 2.0 is 8 bytes per frame. While this was appropriate for exchanging simple data, as more complicated data, such as high-definition video and sensor data, needed to be communicated, it became insufficient.
  •  Deterministic and Reliable: One of CAN 2.0’s advantages is that it is deterministic. Critical information always takes precedence since messages are transmitted in a specific order with priority. Error-checking features are also included in CAN 2.0 to improve data dependability.
  • Why CAN FD Is Required: The limits of CAN 2.0 became more and clearer as technology developed. The creation of CAN FD was prompted by the need for faster data rates, bigger message payloads, and more adaptable communication.

Presenting CAN FD

The introduction of CAN FD, or CAN with Flexible Data Rate, sought to improve upon the drawbacks of CAN 2.0 while preserving its main strengths of dependability and determinism. In terms of data transfer capabilities and applicability to contemporary applications, this new protocol offers considerable advancement.

3. Key Benefits of CAN FD

  • Flexible Data Rate: The biggest benefit is already implied in the name: CAN FD provides flexible data rates. This indicates that it has a range of operating speeds, with a top data rate of up to 5 Mbps. The ever-increasing data requirements in today’s cars and industrial systems must be accommodated, and this flexibility is essential.
  • Extended Message Length: Thanks to frames that can hold up to 64 bytes of data, CAN FD supports longer message payloads. This longer message length is essential for transferring complicated data over the network, such as high-definition video.
  • Backward compatibility with CAN 2.0 is one of CAN FD’s clever design decisions. This permits a smooth transition to the new protocol by allowing older ECUs utilizing CAN 2.0 to live on the same network as newer CAN FD devices.

CAN FD improve error detection and reporting processes, offering a more thorough and trustworthy way to guarantee data integrity?

  • Increased Network Efficiency: By improving data transmission rates and message sizes, CAN FD helps networks be used more effectively, cutting down on latency and improving system performance as a whole.

4. Implementations of CAN FD

The introduction of CAN FD has created new opportunities in a number of different businesses. Here are a few instances of the impact this technology is having:

Can 2.0 Vs. Can Fd | Dorleco
Can 2.0 Vs. Can Fd | Dorleco
  • The automotive sector: CAN FD be a game-changer for the automobile industry? There are several sensors and electrical control units in modern automobiles, and they all demand fast and dependable connection. Advanced driver assistance systems (ADAS) and autonomous driving features can transmit vital data thanks to CAN FD’s flexible data rates and long message durations.
  • Commercial Automation: CAN FD provide a reliable industrial automation option, where real-time data interchange is crucial? Robots and manufacturing equipment can easily communicate with one another, allowing for precise production process control and monitoring. The protocol’s flexibility enables it to meet the various data requirements of many industrial applications.
  • Aviation and Defence: High degrees of dependability and data integrity are required for aerospace and defense applications. CAN FD is a good option for avionics and military systems due to its improved error-checking procedures and capacity for handling huge data payloads.
Can 2.0 Vs. Can Fd | Dorleco
Can 2.0 Vs. Can Fd | Dorleco

5. Challenges and Things to Think About

Even if CAN FD has several benefits, there are some difficulties and things to take into account:

  • Cost: Updating hardware and software may be necessary for CAN FD implementation, which can be expensive, especially for sectors with extensive installations.
  • Complexity: Due to CAN FD’s greater flexibility, network management may become more difficult. For best performance, proper setting and monitoring are necessary.
  • Transition Period: For sectors that already have CAN 2.0 networks in place, the switch to CAN FD may need careful planning in order to prevent interruptions and guarantee backward compatibility.


CAN FD become a key invention in the constantly changing world of automotive and industrial communications? By providing adjustable data speeds, longer message durations, and improved error detection systems, it solves the shortcomings of its forerunner, CAN 2.0. The versatility and dependability of CAN FD make it a crucial technology for the future as the demands for data transfer in both automotive and industrial systems continue to rise. Although switching from CAN 2.0 to CAN FD may be difficult, the advantages in terms of speed, efficiency, and adaptability make the investment worthwhile for sectors looking to stay on the cutting edge of technology.

Tags: No tags

Add a Comment

Your email address will not be published. Required fields are marked *