Experimental Physics and Industrial Control System
Epics core guru's,
The problem is in the epics alarm subroutine:
(snipit from an ai record)
static void alarm(aiRecord *pai)
{
double val;
float hyst, lalm, hihi, high, low, lolo;
unsigned short hhsv, llsv, hsv, lsv;
if(pai->udf == TRUE ){
recGblSetSevr(pai,UDF_ALARM,INVALID_ALARM);
return;
}
hihi = pai->hihi; lolo = pai->lolo; high = pai->high; low = pai->low;
hhsv = pai->hhsv; llsv = pai->llsv; hsv = pai->hsv; lsv = pai->lsv;
val = pai->val; hyst = pai->hyst; lalm = pai->lalm;
/* alarm condition hihi */
if (hhsv && (val >= hihi || ((lalm==hihi) && (val >= hihi-hyst)))){
if (recGblSetSevr(pai,HIHI_ALARM,pai->hhsv)) pai->lalm = hihi;
return;
}
The comparison between a double and a float is okay as long as the precision of
the comparison is not very large. For instance
if val = 125303.000 and hihi = 125303.001 the above comparision
would give you an alarm.
On the surface the solution would be to change the type of hihi to
be double but on further inspection the ascii file for this record
says that the field is DBF_FLOAT? Does this imply that the
size of the record must also change?
Your insight would be greatly appreciated.
Oh by the way I'm using:
Epics version 3.13.0Beta 12
mv167
Hp-ux 10.2 unix host
______________________________________________________________
Sue D. Witherspoon TJNAF - CEBA
[email protected] (757) 269-7579
If my people would Humble, Pray, Seek and Turn....2 Chron. 7:14
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