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Wagner, W.H.

Paper Title Page
FPAT075 Using a Control System Ethernet Network as a Field Bus 3961
 
  • W.R. DeVan, S.E. Hicks, G.S. Lawson, W.H. Wagner, D.M. Wantland, E. Williams
    ORNL, Oak Ridge, Tennessee
 
  A major component of a typical accelerator distributed control system (DCS) is a dedicated, large-scale local area communications network (LAN). The SNS EPICS-based control system uses a LAN based on the popular IEEE-802.3 set of standards (Ethernet). Since the control system network infrastructure is available throughout the facility, and since Ethernet-based controllers are readily available, it is tempting to use the control system LAN for "fieldbus" communications to low-level control devices (e.g. vacuum controllers; remote I/O). These devices may or may not be compatible with the high-level DCS protocols. This paper presents some of the benefits and risks of combining high-level DCS communications with low-level "field bus" communications on the same network, and describes measures taken at SNS to promote compatibility between devices connected to the control system network.

Work supported by the U.S. Department of Energy under Contract DE-AC05-00OR22725.