May I introduce myself: CAN FD

The CAN-FD protocol was first introduced at the 13th international CAN Conference in 2012 and was again the main topic at last year’s 14th iCC in Paris.

07/28/2014


Figure 1: The CAN FD demonstrator comprised several CAN FD prototype boards based on the FPGA by Bosch and two evaluation boards by Freescale and ST-Microelectronics. Courtesy: Holger ZeltwangerAt the 13th international CAN Conference in Germany in 2012, Bosch (Germany) introduced the CAN-FD protocol. At last year's 14th iCC in Paris, CAN FD was again the main topic. This CAN data link layer protocol overcomes two CAN protocol limitations: The data-rate limit of 1 Mbit/s and the 8-byte limit of the data-field length. Using the CANopen application layer on a CAN-FD network allows faster transmissions as well as longer Process Data Objects (PDO) and Emergency messages (EMCY). Using longer data-fields also increases the throughput for software downloads, but this requires new SDO protocols.

CAN FD has already been submitted for international standardization. At the Embedded World exhibition 2014 in Nuremberg (Germany), Bosch presented its CAN FD demonstrator, which integrates micro-controllers with CAN FD modules from Freescale and ST-Microelectronics. Other chipmakers such as Infineon, Renesas, Spansion, etc. have also launched their CAN FD modules, which are available as samples. Toolmakers and suppliers of interface boards also announced CAN FD support. Bosch's demonstrator was improved from the year before, with a length of about 70 m and mixed topologies. Besides the bus-line it comprised a passive star similar to the one used in Mercedes cars. The CAN FD network runs at a 500-kbit/s arbitration bit-rate. In the data-phase, the speed was increased to 4 Mbit/s. Of course, this was under laboratory conditions, meaning about 20 °C.

Transceiver supporting higher speeds (4 Mbit/s or 5 Mbit/s) are under development or have been pre-announced. In general, transceivers compliant to ISO 11898-2/5/6 can be used for CAN FD for dataphase bit-rates up to 1 Mbit/s. Last year, NXP was the first company to qualify its Mantis chips for 2-Mbit/s transmission rates. In the meantime Freescale, Microchip, ON Semiconductor, and Texas Instruments have introduced similar products. The main issue is the symmetry of the rising and the falling edges, which requires above 1 Mbit/s. Electromagnetic compatibility (EMC) and electrostatic discharge (ESD) are critical requirements in harsh industrial and automotive environments due to the close proximity of a wide range of networked electronic systems and devices. This means CAN FD compliant transceivers need to meet automotive EMC requirements (± 6 kV ESD and > 36 Bm DPI) without external noise filtering.

When CAN FD and classic CAN controllers are used in the same network, the communication is limited to classic CAN frames. Receiving a CAN FD frame would cause an Error frame transmission by the Classic CAN controllers. Several migration paths from Classical CAN to CAN FD have been discussed at the last two international CAN Conferences. At the CAN FD Tech Day in Tokio, NXP presented an idea on how to run Classic CAN controllers in a CAN FD network. It is based on a transceiver able to filter CAN FD messages and also the Error frames caused by the Classic CAN chip.

CiA plans to set-up interoperability test systems for CAN FD soon. The nonprofit association will provide different network topologies (bus-line and star) and test if CAN FD nodes can communicate correctly without causing error frames. Within ISO the CAN FD protocol is in the progress of being standardized. The C & S Group is preparing a CAN FD conformance test plan and its implementation. Several CiA task forces specify or recommend the usage of CAN FD networks.

Experts in ISO have been discussing the standardization of the CAN FD protocol for a couple of months. It will be introduced in the next revision of the ISO 11898-1 standard. The reviewed document has already successfully passed the Committee Draft voting. The general concepts of the CAN FD protocol as proposed by Bosch have not been changed. The next step after implementing the received comments, the Draft International Standard will be distributed for balloting.

- Edited by Brittany Merchut, Project Manager, CFE Media, bmerchut(at)cfemedia.com 



Engineers' Choice Awards
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by Control Engineering subscribers.
System Integrator Giants
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
System Integrator of the Year
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
How to Maximize Factory Automation Efficiency with Low Cost Machine Vision
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Wireless Reliability in Harsh Environments
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
Human Factors and the Impact on Plant Safety
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
August 2018
Augmented reality and virtual reality education, autotuning PID control, cybersecurity advice, educating engineers
July 2018
Ladder logic best practices and object-oriented programming, safety instrumented systems, enclosure design issues and challenges, process control advice
June 2018
Discrete and process sensor fundamentals, autotuning controls, system integrator roundtable
Edge Computing
This article collection contains several articles on how today's technologies heap benefits onto an edge-computing architecture such as faster computing, better networking, more memory, smarter analytics, cloud-based intelligence, and lower costs.
Data Center Design
Data centers, data closets, edge and cloud computing, co-location facilities, and similar topics are among the fastest-changing in the industry.
PLCs
Programmable logic controllers (PLCs) represent the logic (decision) part of the control loop of sense, decide, and actuate. Featured articles in this digital report compare PLCs and programmable automation controllers (PACs), industrial PCs, and robotic controllers.
SIDB

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

August 2018
SCADA standardization, capital expenditures, data-driven drilling and execution
June 2018
Machine learning, produced water benefits, progressive cavity pumps
April 2018
ROVs, rigs, and the real time; wellsite valve manifolds; AI on a chip; analytics use for pipelines
John O. Ayuk, PE, CFSE, PMP, CAP
Automation Engineer; Wood Group
Doug Baker
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
Data Centers: Impacts of Climate and Cooling Technology
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
Safety First: Arc Flash 101
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
Critical Power: Hospital Electrical Systems
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
Engineers' Choice Awards
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by Control Engineering subscribers.
System Integrator Giants
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
System Integrator of the Year
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
How to Maximize Factory Automation Efficiency with Low Cost Machine Vision
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Wireless Reliability in Harsh Environments
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
Human Factors and the Impact on Plant Safety
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
August 2018
Augmented reality and virtual reality education, autotuning PID control, cybersecurity advice, educating engineers
July 2018
Ladder logic best practices and object-oriented programming, safety instrumented systems, enclosure design issues and challenges, process control advice
June 2018
Discrete and process sensor fundamentals, autotuning controls, system integrator roundtable
Edge Computing
This article collection contains several articles on how today's technologies heap benefits onto an edge-computing architecture such as faster computing, better networking, more memory, smarter analytics, cloud-based intelligence, and lower costs.
Data Center Design
Data centers, data closets, edge and cloud computing, co-location facilities, and similar topics are among the fastest-changing in the industry.
PLCs
Programmable logic controllers (PLCs) represent the logic (decision) part of the control loop of sense, decide, and actuate. Featured articles in this digital report compare PLCs and programmable automation controllers (PACs), industrial PCs, and robotic controllers.
SIDB

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

August 2018
SCADA standardization, capital expenditures, data-driven drilling and execution
June 2018
Machine learning, produced water benefits, progressive cavity pumps
April 2018
ROVs, rigs, and the real time; wellsite valve manifolds; AI on a chip; analytics use for pipelines
John O. Ayuk, PE, CFSE, PMP, CAP
Automation Engineer; Wood Group
Doug Baker
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
Data Centers: Impacts of Climate and Cooling Technology
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
Safety First: Arc Flash 101
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
Critical Power: Hospital Electrical Systems
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
Engineers' Choice Awards
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by Control Engineering subscribers.
System Integrator Giants
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
System Integrator of the Year
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
How to Maximize Factory Automation Efficiency with Low Cost Machine Vision
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Wireless Reliability in Harsh Environments
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
Human Factors and the Impact on Plant Safety
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
August 2018
Augmented reality and virtual reality education, autotuning PID control, cybersecurity advice, educating engineers
July 2018
Ladder logic best practices and object-oriented programming, safety instrumented systems, enclosure design issues and challenges, process control advice
June 2018
Discrete and process sensor fundamentals, autotuning controls, system integrator roundtable
Edge Computing
This article collection contains several articles on how today's technologies heap benefits onto an edge-computing architecture such as faster computing, better networking, more memory, smarter analytics, cloud-based intelligence, and lower costs.
Data Center Design
Data centers, data closets, edge and cloud computing, co-location facilities, and similar topics are among the fastest-changing in the industry.
PLCs
Programmable logic controllers (PLCs) represent the logic (decision) part of the control loop of sense, decide, and actuate. Featured articles in this digital report compare PLCs and programmable automation controllers (PACs), industrial PCs, and robotic controllers.
SIDB

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

August 2018
SCADA standardization, capital expenditures, data-driven drilling and execution
June 2018
Machine learning, produced water benefits, progressive cavity pumps
April 2018
ROVs, rigs, and the real time; wellsite valve manifolds; AI on a chip; analytics use for pipelines
John O. Ayuk, PE, CFSE, PMP, CAP
Automation Engineer; Wood Group
Doug Baker
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
Data Centers: Impacts of Climate and Cooling Technology
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
Safety First: Arc Flash 101
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
Critical Power: Hospital Electrical Systems
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me