Experimental Physics and
Industrial Control System

De : Mark Rivers <rivers at cars.uchicago.edu>
Envoyé : lundi 19 septembre 2022 17:53
À : Matthew Newville <newville at cars.uchicago.edu>
Cc : LE-DANIEL Erwann <erwann.le-daniel at alstomgroup.com>; tech-talk-request at aps.anl.gov; tech-talk at aps.anl.gov
Objet : Re: warnings.warn from raspberry pyepics

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If I understood his last message correctly it works OK printing values for 10 seconds, and then it fails.  So it does find the PV.



Hi Le Daniel, 

 

I would guess that the PV is actually not being found on the network.  Is EPICS_CA_ADDR_LIST set so that the IOC or CA server providing that PV can be found?

 

 

On Mon, Sep 19, 2022 at 7:18 AM LE-DANIEL Erwann via Tech-talk <tech-talk at aps.anl.gov> wrote:

Hello,

 

I’m using a raspberry to get epics variable value from that code :

 

 

import epics

import time

 

while True:

               p=epics.PV(‘TL_AN_Input’)

               val = p.get()

               print (val)

               time.sleep(0.1)

 

 

 

 

This code runs about 10 seconds and after it returns the error message :

 

/home/pi/.local/lib/python3.9/site-packages/epics/ca.py:1528: UserWarning: ca.get(‘TL_AN_Input…’) timed out after 1.00 seconds.

Warnings.warn(msg % (name(chid), timeout))

 

What does it mean ?

Is it because I need to clean the PV_cache ?  è if it is the case how can I do that ?

 

Thank you very much.

 

Cordialement,

LE DANIEL Erwann.

 

 

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