Experimental Physics and
Industrial Control System

"Allison, Stephanie" <[email protected]> · Mon, 31 Jan 2005 10:32:06 -0800

Hi,

> Use DRVH & DRVL so that the database rejects out of range values
> rather than relying on the client application to do this.

Just a side note about AO limit checking and monitor updates.  If an AO is already at a DRV limit and the user types in a value beyond the DRV limit, the ao record processes and correctly sets the value back to the DRV limit but if MDEL is set to 0, the record will NOT post a monitor.  However, depending on how the CA client gui is programmed (say if it only updates on monitor change), it may leave the user's new value showing.  I think most EPICS gui clients are OK but to be safe, for AO records that aren't knobbed or periodically processed, I set MDEL to -1 so it updates whenever if processes.  You may want to test that your gui's do the right thing and override the user's value with the last value in this case.

Stephanie Allison

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System