Experimental Physics and
Industrial Control System

Thank you for your answer.I've solved my problem.
I need to loop to create an associated class object for each pv.Then use each class object to execute the monitor function.
For example
 |  for i in range(51):
 |	if pvnames[i] == 'xkSun:test50Scalar:aiExample1':
 |          globals()['pv' + str(i)] = pv_monitor(pvnames[i])
 |          globals()['pv' + str(i)].my_monitor()
 |  def my_monitor(self):
 |     ctxt.monitor(self.pv, self.onChanges)

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Subject:
Re: How can I use pvapy or p4p to monitor multiple PVS
From:
Marty Kraimer via Tech-talk <tech-talk at aps.anl.gov>
To:
tech-talk at aps.anl.gov
Date:
Tue, 13 Oct 2020 06:06:15 -0400
What Mark said should work.
Note that pvaPy also has methods: subscribe,unsubscribe,startMonitor,stopMonitor.
For example
 |             def echo(x):
 |                  print 'New PV value: ', x
 |              channel = Channel('exampleFloat')
 |              channel.subscribe('echo', echo)
 |              channel.startMonitor()

Marty

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Subject:
Re: How can I use pvapy or p4p to monitor multiple PVS
From:
Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>
To:
"qt980319 at mail.ustc.edu.cn" <qt980319 at mail.ustc.edu.cn>
Cc:
"sunxk at ustc.edu.cn" <sunxk at ustc.edu.cn>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date:
Tue, 13 Oct 2020 03:54:32 +0000
However, in the process of testing it, it was found that only a single PV can be monitored

In p4p can’t you just call the monitor() method multiple times, once for each PV that you want to monitor?

In pvapy can’t you just create a Channel object for each PV, and call it’s monitor() method?

Mark

Replies:

Re: How can I use pvapy or p4p to monitor multiple PVS Veseli, Sinisa via Tech-talk

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