Experimental Physics and
Industrial Control System

"J. Frederick Bartlett ([email protected])" <[email protected]> · Tue, 09 Apr 2002 10:54:06 CDT

Kay,

  I would suggest a small modification to your proposal. As in the
present case, there frequently is a need to add a few more "bits" of
behavior-controlling mode to a record.  Rather than adding a new field
every time someone needs to add new "behavior", I suggest adding a
bit-encoded long word to the record and assign the bits, as needed,
from the low-order end.  As problems, like the clamp behavior, arise
the next unused bit(s) can be assigned to hold the new mode state.

  In building an EPICS-based control system for the D0 experiment, I
decided to add a few custom record types to handle the complex behavior
of some of our devices. All of these records have just such a mode
field to handle the class of problem that you have encountered.

						Fritz

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System