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IS CAN Bus – CiA WD 103 Update Rick Ales Swagelok Company CPAC May 2006

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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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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.