IS CAN Bus – CiA WD 103 Update
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IS CAN Bus – CiA WD 103 Update Rick Ales Swagelok Company CPAC May 2006. NeSSI Bus History. 2000-1 Wireless, Bluetooth preferred solution 9/2001 Selected CAN bus as preferred solution 7/2003 ODVA & NIST IS CAN workshops 2/2004 Profibus PA selected for DoE project

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IS CAN Bus – CiA WD 103 UpdateRick Ales Swagelok CompanyCPAC May 2006


Nessi bus history
NeSSI Bus History

  • 2000-1 Wireless, Bluetooth preferred solution

  • 9/2001 Selected CAN bus as preferred solution

  • 7/2003 ODVA & NIST IS CAN workshops

  • 2/2004 Profibus PA selected for DoE project

  • 6/2004 IEEE p1451.6 Working group formed

  • 7/2004 Foundation Fieldbus for DoE project

  • 1/2005 IEEE p1451.6 IS CAN Draft Spec.

  • 3/2005 Fieldbus Foundation and CPAC announce FF

  • 5/2005 DoE project defunct.

  • 1/2006 Transition p1451.6 effort to CiA WD 103

  • 3/22/06 CiA WD 103 Meeting.

  • 3/31/06 North America CiA office transitions to DE.




Is can major parameters
IS CAN Major Parameters

  • The CAN communication model is described in /ISO11898-1/ and /CiA301/.

  • Single power source, co-cable was the only option considered.

  • Power bus specification is derived from commercially available IS power systems.

  • 9.5 Vdc @ 1.0 A Maximum

  • 10 Meter cable distance

  • M12, 5 circuit connector


Why only 10 meters
Why Only 10 Meters?

  • Since this system is expected to work with NAMUR IS solenoid valves, which require 7.7 volts.

  • IOMAX = 1 amp

  • VOMAX = 9.5 V

  • With typical 5% regulation, then:

  • VOTYP = 9.0 V, VOMIN = 8.6 V

  • For a 10 m @ 24 AWG, resistance is 0.87 ohms

  • 1 amp * 0.87 ohms = 0.9 V

  • Therefore, actual power delivered to the device could be:

  • VDEV MIN = 8.6 V – 0.9 V = 7.7 V




What is next
What is next?

  • Bill Seitz, President IXXAT to replace C. Menon as committee chair.

  • Sigrid Stramka, CAN in Automation, DE, assigned as CiA technical representative.

  • Next CiA WD 103/ IEEE 1451.6 teleconference to be scheduled for early June.

  • Update Draft Standard and circulate for general review & comment.

  • Develop & validate an apparatus example circuit.



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