Experimental Physics and
Industrial Control System

Bernhard Kuner <[email protected]> · Tue, 30 Nov 2004 09:09:02 +0100

Hallo 黄松:

After reboot an EPICS database all records are STAT=INVALID, UDF=1.
First Processing of the record will reset the UDF field to 0 and set
STAT to the status that matches the result of the processing - NO_ALARM
if no bad things happen. Your ao-record is an OUT record, so it is ok if
it is UDF INVALID, as long as nobody wrote something to it.

Another point is to initialize it to a reasonable start value - this is
an old EPICS problem, because OUT records have no link field to be
initialized after reboot from another record that provides a readback of
the hardware. If there is any hardware to readback the
"TC:PS:B1:AI1:current" it is Your turn to set your ao-record to this
value after reboot of the IOC.

best regards

Bernhard Kuner

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System