Experimental Physics and
Industrial Control System

John William Sinclair <[email protected]> · Fri, 18 Dec 2009 01:05:47 -0500

Note that ControlLogix communications (multicast with tcp messaging)

includes a fairly severe penalty for using the

tag names. There are a limited number of cip resources (255 is common).

Each module consumes several and each IOC access

by tag name consumes one. As a result, we always use arrays and end up

in the same old boat of having to do lots of name

mapping to array position. In principle the tag names are very nice; in

practice they are not too useful.

John Sinclair

David Dudley wrote:

For NSLS-2, all configuration and logic is planned to be incorporated

into the IRMIS system, as a single database layout.

In addition, I should have initially mentioned that one of the primary

reasons for the A-B choice is that it uses a communications format

named ‘CIP’, and its internal memory configuration is entirely driven

by TAGNames.

In tne ControlLogix platform, you do not do programming or

configuration by having to remember or know things like “...

‘B-703:R-E5<OTB>T-1’ is wired to terminal IW102... (That’s Building

703, Room E5, Optical Testing Lab, Temperature 1)” .

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System