Argonne National Laboratory

Experimental Physics and
Industrial Control System

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<== Date ==> <== Thread ==>

Subject: PV name length limit
From: mcgehee@noao.edu
Date: Tue, 17 May 1994 08:16:30 -0700
	Are there any plans to increase the current 28 character limit on 
record names? 
	Our rational for asking is this: the Gemini control system has four
major components - 
	1) TCS (Telescope Control System) - beam control
	2) ICS (Instrument Control System) - detector control
	3) DHS (Data Handling (and Reduction) System) - data management
	4) OCS (Observatory Control System) - highlevel sequencing, preprogrammed
	observing management.

Of these the TCS and ICS are clearly IOC-based. The issue here is that the OCS
lives in a world of high-level configurations whose directives are phrased in
fairly human readable terms and that we would like to have all four systems
use a common name-space. We realize that it is possible to set up a translation
between the name-space used by the OCS and that used by the IOC-based systems
but would prefer a consistent naming convention - and not have to worry about
record name lengths!

	As a general issue on system architecture - I would guess that most
experimental physics control systems would use a similar system breakdown -
except in more 'engineering mode' cases where the OCS would be absent.

	Does anyone else use the equivalent of the OCS?

Peregrine
	

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