Experimental Physics and
Industrial Control System

[email protected] (Tim Mooney) · Thu, 10 Dec 1998 18:07:56 -0600

re...

> I have been trying to get some links between record in different crates.
> What I am trying to accomplish at this time is a master enable switch
> between two crates for data acquisition.  Crate 1 & Crate 2 both have an
> enable record (a bo).  The enabled signal is passed in hardware from crate1
> to crate2.  I would like to pass the two enables into the INPA and INPB
> field of a calc record.  I have FLNK'd both to a calc record in the fist
> crate(cross crates to the .PROC field according to some docs).  The val
> field of the bo's are passed into the approriate INPx.   The VAL field of
> the calc is then passed to the master enable record's DOL, yes I'm in Closed
> loop here.  The first enable, the one in the the same crate, passes to the
> calc fine but I see no changes to the 2nd.  dbpr on the calc and on the
> bo's. shows that the links have been made.  The first bo shows as a DB_LINK
> and the second shows as a CA_LINK.  The forward link from crate 2 also shows
> as a CA_LINK.
> It does not seem that changing the 2nd enable's VAL has any effect at all in
> crate 1.  I checked this by shitching TPRO in the calc record.

Are you sure the second crate's bo record is getting processed?
I don't know if you're testing the actual system including the hardware link,
or just simulating the behavior you expect by writing to the second crate's bo
record. If the latter, I'm guessing the second crate's bo record is "I/O Intr"
scanned, so writing to it's VAL field would not cause it to process.

In any case, I'd simplify by deleting the forward links and making CP input
links from the calc record's INPx fields to the bo records' VAL fields.

Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System