Experimental Physics and
Industrial Control System

Nick Rees <[email protected]> · Tue, 21 Aug 2001 16:30:59 -1000 (HST)

We are running R3.13.4 and have a problem.

It seems that in our system when an Analog Output record with SMSL
closed_loop has its DOL link marked CPP and is linked to a PV on another
crate, then if the other crate reboots the scanOnce task generates a
floating point exception within the Ao record support routines and
suspends.

I suspect the crate with the Ao record on it must be a RISC architecture
(ours is Heurikon hkbaja 4700E, so is a MIPS R4000 processor), or else it
wouldn't generate the FPE. The other crate can be 68k or RISC.

We haven't really tracked this down yet (i.e. we are still working with
the live systems and haven't isolated it to some test crates), but it
looks like a problem with connection management using CA links in the
database generating an uninitialised floating point value.

Has anyone seen this sort of thing before, and is there a fix?

Cheers,

-- 
Nick Rees

Joint Astronomy Centre               Ph:       +1 (808) 961-3756
660 N. Aohoku Place                  Fax:      +1 (808) 961-6516
Hilo, HI.  96720                     Internet: [email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System