1. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 1 EI200118283 DECEMBER-2004 CAN-based Higher Layer Protocols and Profiles The Technical Seminar Presented by Rajaaranjan Mishra Roll # EI200118283 TO THE DEPARTMENT OF ELETRONICS AND INSTRUMENTATION Under the guidance of Miss. Suchilipi Nepak

2. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 2 EI200118283 DECEMBER-2004 INTRODUCTION:   What is CAN?   What Industries are using CAN?   What is the key business and technical reason to use CAN?

3. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 3 EI200118283 DECEMBER-2004   What is CAN-based Higher Layers protocols?   Why Requirement of Higher Layers? the transmission of data blocks longer than 8 bytes acknowledged or confirmed data transfer identifier distribution network start-up or the supervision of nodes

4. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 4 EI200118283 DECEMBER-2004 Main Items of CAN-based Higher Layer Protocols:   Message identifier assignment system   Method of exchanging Process Data   Peer-to-peer communication   Method of establishing Process Data connections   Network management   Principle of device modeling and device profiles

5. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 5 EI200118283 DECEMBER-2004 Message Identifier Assignment System: [Identifier Usage in CAL/CANopen]

6. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 6 EI200118283 DECEMBER-2004 Explicit messages between a Slave and a Master device based on the predefined connection set:   Explicit Message channel   Master Poll/Change of State/Cyclic channel   Slave I/O Change of State/Cyclic channel Bit   Strobe channel

7. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 7 EI200118283 DECEMBER-2004 The meaning of a SDS message is determined by three elements:   Dir / Pri bit   Logical address (7 bit)   Service Type (3 bit)

8. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 8 EI200118283 DECEMBER-2004 Exchange of Process Data:   Message Triggering   Mapping of Application Objects Done in two steps

9. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 9 EI200118283 DECEMBER-2004 Peer-to-Peer Communication channels:   For configuration of devices by means of a configuration tool, multi-purpose communication channels are required.   These non-time-critical communication channels always exist between a configuration tool and the device to be configured.   The transfer of data has to be performed by means of different higher layer protocols which support some kind of device configuration provide this kind of peer-to-peer communication facility.

10. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 10 EI200118283 DECEMBER-2004 Establishment of Process Data Message Connections:   Allocation of identifiers to the transmit messages of the message producers respectively receive messages of the message consumers establishes the communication paths in a CAN network.   Establishing message connection is possible through uses of predefined messages with already allocated message identifiers or through a variable allocation of identifiers to messages.

11. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 11 EI200118283 DECEMBER-2004 Network Management:   Main tasks of network management are to detection and indication of failures in the network and services which allow to control the communication status of the distributed nodes.

12. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 12 EI200118283 DECEMBER-2004 [Device Net I/O Connection Object State Transition Diagram]

13. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 13 EI200118283 DECEMBER-2004 Device Modeling and Device Profiles: DeviceNet device profile must contain the following information:   an object model for the device type   the I/O data format for the device type   configuration data   the public interfaces to that data

14. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 14 EI200118283 DECEMBER-2004 [DeviceNet Object Model]

15. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 15 EI200118283 DECEMBER-2004 [SDS Object Hierarchy]

16. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 16 EI200118283 DECEMBER-2004   A Physical Component may contain 1-125 Logical Devices (Addressable Devices)   A Logical Device may contain up to 32 Embedded Objects [SDS Component Model]

17. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 17 EI200118283 DECEMBER-2004 Conclusion:   Due to the widespread use of the CAN protocol from automotive to any kind of industrial applications, several classes of higher layer protocols have been developed.   For heavy bus and truck and related applications the SAE J1939 standard has been widely accepted in the USA.

18. National Institute Of Science & Technology CAN-based Higher Layer Protocols and Profiles Rajaaranjan Mishra 18 EI200118283 DECEMBER-2004