There are several cases in which I may want to slow down ( and even
stop ) scan rates.
1/ debugging purpose
Debugging messages are displayed each time the record
is processed. When my Ioc crashes I do not want to be flooded
with debugging information. Ultimately I want to see only the
debug info of the record that crashed the ioc.
2/ overload of an ioc
I want to put as many devices on an ioc as possible
so I need to minimize record processing.
That is one way to improve uptime and lower cost
of control system
3/ Bus conflict
There are also bus conflict I want to minimize
(several devices on same gpib bus, etc. )
4/ temperature can be read by another more accurate device
5/ temperature cannot change due to external factors. Granted that
regulation may fail due to a failure of the regulating device itself, in
that case we have a device alarm that trip.
The thermo regulator device I was referring to complies with all of the
above.
Anyway what is interesting to me at this point is to change scan rate
from high to low. I want to see the readback transition at high
resolution and slow the scan rate once everything stabilize.
I like the NPP & PP trick in the calcout.
The sequencer is also a great solution.
Now I can pick between a value based versus a time based solution.
Many thanks for your input,
--
Emmanuel Mayssat
On Thu, 2006-01-05 at 12:37 -0500, Steven Hartman wrote:
> be set by the operator using an MEDM "menu" button. But for something like
> the temperature readback, I would just leave it at the fast rate all of
> the time.
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