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<== Date ==> <== Thread ==>
Subject: Re: Channel Access implementation for Siemens S71500 PLCs
From: "Johnson, Andrew N. via Tech-talk" <[email protected]>
To: "[email protected]" <[email protected]>
Date: Mon, 13 May 2019 16:13:55 +0000
Hi Miklós,

On 5/13/19 6:47 AM, Miklós Boros via Tech-talk wrote:
 

I’m preparing a paper for this year’s ICALEPCS with the title: “An EPICS Channel Access Implementation on Siemens PLCs”.

I wrote a PLC code in my free time in TIA portal (SCL) as a library that implements EPICS Channel Access protocol v13. I came up with a way to easily declare PVs directly in the PLC code, so the PLC can talk directly with CS-Studio, Archiver Appliance, BEST… etc. without an IOC in-between.

Sounds interesting, I look forward to seeing the paper (we don't use Siemens PLCs here but many other EPICS sites do).
 

I’m currently testing the S7EPICS PLC code with CS-Studio, Archiver Appliance and BEST on a real cryogenics scenario. It works well so far.

 

If you have any suggestion how to test it further or what kind of stress-test should I perform, please don’t hesitate to tell me. If you know any real-life scenario when this EPICS<->PLC communication could be useful, please send me.

For general-purpose Channel Access testing there is a program built in all Base versions called acctst which performs a series of regression tests against a named PV. if you haven't already done so I would suggest running this against a PV from your PLC-based server (compare the results with a PV from a regular IOC). Some documentation on how to use it is available at https://epics.anl.gov/base/R7-0/2-docs/CAref.html#acctst.

There are a some other groups in the EPICS world who have implemented CA client and server libraries who might have suggestions; in particular the NSLS-2 project caproto could be helpful if you speak Python.

- Andrew

-- 
Complexity comes for free, Simplicity you have to work for.
References:
Channel Access implementation for Siemens S71500 PLCs Miklós Boros via Tech-talk
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