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IS CAN Bus – CiA WD.103 Update on NeSSI Bus System

This update covers the history and major parameters of the IS CAN NeSSI Bus System, including power specifications and cables. It also outlines upcoming changes and developments in the industry.

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IS CAN Bus – CiA WD.103 Update on NeSSI Bus System

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

  2. 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.

  3. CiA WD 103 Attendees

  4. IS CAN NeSSI Bus System

  5. 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

  6. 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

  7. Associated Apparatus Entity Parameters

  8. System Power Parameters

  9. 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.

  10. Discussion?

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