Experimental Physics and Industrial Control System
On Wednesday 16 August 2006 22:22, Mark Rivers wrote:
> Yes, there is a version of EPID which works with EPICS 3.14.x.
>
> It is included in the "std" module in synApps.
>
> http://www.aps.anl.gov/aod/bcda/synApps/std/std.html
Just stumbled over a documentation bug in
http://www.aps.anl.gov/aod/bcda/synApps/std/epidRecord.html
Introduction says
>The major improvements in the EPID record compared to the PID record
> include:
> [...]
> Changed the time units of the KI and KD terms from minutes to seconds
However, Section "Feedback Parameters" says
> Field Summary [...]
> KP Proportional Gain [...]
> KI Integral Gain, in repeats per minute [...]
> KD Derivative Gain, in repeats per minute [...]
which leaves me to wonder whether I would have to re-scale KI and KD
when moving from pid to epid or not.
Another question with regard to replacing pid by epid: Apart from teh
above scaling issue, have I understood it correct that if the following
scenario:
a pid record controlling an ao record, the latter in OMSL=closed_loop,
output OIF=incremental mode, DOL referencing pid's DM
would be replaced by
epid record having OUTL point to ao record's VAL, ao record in OIF=full
and OMSL=supervisory mode?
then everything should work the same as before (modulo bugs/unwanted
features)?
Ben
--
You've never looked into my eyes but don't you want to know
What the dark and the wild and the different know -- Melissa Etheridge
- References:
- looking for OSI version of epid record Dayle Kotturi
- RE: looking for OSI version of epid record Mark Rivers
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