Experimental Physics and
Industrial Control System

[email protected] (Deb Kerstiens) · Thu, 3 Feb 2000 10:11:18 -0700

> 
> I don't know enough about how Bob's archiver handles these bumpless
> reboot situations. (I guess it is by IOC, not by record.) Most of our
> outputs are read back during IOC initialisation (the inherent luxury of
> a fieldbus based design) --- this is handled record-wise by device
> support looking at the PINI field.
> 
> Specifying "readback wanted" in the OUT link seems absolutely
> appropriate in your case.
> 
> Maybe all output records should have a menu-type field that specifies if
> readback at init time should be performed.
> 
> Should they?
> 
> Ralph
>

I don't like to have to process the output records and cause any resulting 
processing just to get the current value of an output record after a reboot, 
so it would be great to add the selectable readback to all output records
or add something like RINI (read at initialization) to read but not process.

We might consider one additional subtlety for those of us who use STAT and/or
SEVR, particularly to display value with a color rule that indicates these
values.  If an output record had readback but was not processed, would it affect
STAT and/or SEVR values.  Right now I think these are usually UDF and INVALID
respectively until the record is processed. 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System