Experimental Physics and
Industrial Control System

-------- Forwarded Message --------
From: Simon Reiter <[email protected]>
To: [email protected]
Subject: fast PV transition skipped?
Date: Tue, 1 Oct 2019 11:55:29 +0200

Hi,

I am observing a strange behavior with EPICS 3.16 and the sequencer v2.2.7. But
I fear
it origins in base. So this is, what is used:

1. I set a mbbo PV "main:req" from 1 to 3(e.g. by caput)
2. A calcout PV pushed to a dfanout (input as CPP)
3. dfanouts pushes to second mbbo "sub:req"
4. sequencer reacts onto second mbbo and changes its state correctly rom 1 -> 2
(visible via logging)
5. a thrid mbbo "sub:cur" is set by the sequencer (using SYNC and usleep(100) )

6. I set the first mbbo PV "main:req" back to 1
7. repeat of step 2 and 3
8. sequencer needs to go from state 2 to state 4 before going back to state 1
(also visible via logging)

But in case I do step 1 and 6 too close to each other, step 8 seems to not push
the state correctly. The logging inside the IOC shows me that the state was
included in the transistions.


This is my logging via camonitor:

caput main:req 3 && caput main:req 1

--- works ---
sub:req       2019-10-01 09:37:20.373428 3
sub:req       2019-10-01 09:37:20.410165 1

sub:cur       2019-10-01 09:37:20.374262 2
sub:cur       2019-10-01 09:37:20.410946 4
sub:cur       2019-10-01 09:37:20.411308 1

--- fails ---
sub:req       2019-10-01 09:37:50.956651 3
sub:req       2019-10-01 09:37:50.993201 1

sub:cur       2019-10-01 09:37:50.957223 2
sub:cur       2019-10-01 09:37:50.994039 1


Currently I have not yet stripped my project to a very small version and there
is more than just 1 sub in total.



In addition to this I have a copy (simple calcout with CPP as input) of sub:cur
in a separate IOC on a different host (actually ppc). I observed that this PV
is not updated properly as well sometimes:

sub:cur       2019-09-30 17:45:23.270295 2
copy:sub:cur  2019-09-30 17:45:23.270986 2
sub:cur       2019-09-30 17:45:25.280127 3
sub:cur       2019-09-30 17:45:25.280533 1
copy:sub:cur  2019-09-30 17:45:25.281447 1



With EPICS 3.14 this does not occur.

Any idea, what might have changed and where this problem is connected to?

Best regards,
Simon


-- 
Simon Reiter
II. Physikalisches Institut
Justus-Liebig-Universität
Heinrich-Buff-Ring 14
D-35392 Giessen
Tel: +49 641 99 33250

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