Experimental Physics and
Industrial Control System

"Allison, Stephanie" <[email protected]> · Wed, 22 Apr 2009 08:29:42 -0700

Hi Pete,

> I have a problem propagating error states in my database. I have two mbbo records
> controlled through two edm buttons. These records when processed forward link to a calc
> record which calculates a value based on the two mbbo records which is then sent via
> streams and RS232 to a current amplifier (see db below). This all works fine until I get an
> RS232 communications error. Streams correctly detects the comms error and puts the
> longout record into error state (STAT TIMEOUT, SEVR INVALID). What I need to do is
> propagate this error state back to the mbbo records so that it is visible on the edm screen.
> Adding maximise severity to the existing links wont work because of the direction of the
> forward links. Clearly I can add stuff to the edm screen to display the error state of the
> longout record but this wont help with other client applications we have which talk directly
> to the mbbo PV's. I really want the mbbo records to reflect the error state of the longout
> record. Is there any way this can be achieved?
> 
> I tried linking the SDIS from the mbbo to the longout record with maximise severity set.
> This did make the mbbo reflect the longout's error state but only after being processed a
> second time so is far from ideal.

You can set the SDIS PV to "<name>.SEVR CP MS" to force processing on change of severity.  Of course, with DISV something not 0 to 3.

Stephanie Allison

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System