Hey Chris and Patrick,
I've had a look on ADS driver in context of TC2 and I found that i.e.
subscriptions do not work when initial symbol discovery is disabled
(load-symbol-and-data-type-tables=false).
Subscriptions did fail due to missing data type mapping, even for most
basic types. I suppose that it could be same for writing where a proper
write buffer needs to be allocated.
Best,
Łukasz
On 17.10.2023 13:40, Patrick Boisclair wrote:
Hi Chris,
I will continue to investigate and test today and I'll share what I can find.
The PLC type is a "CX8190 / Standard"
I really appreciate your help on this.
Patrick Boisclair
Email: [email protected]
-----Original Message-----
From: Christofer Dutz <[email protected]>
Sent: Tuesday, October 17, 2023 3:14 AM
To: [email protected]
Subject: AW: PLC4X - 0.11.0 - Issue writing value to a Beckhoff PLC using ads
driver
Attention: Courriel provenant de l'externe. Veuillez valider la source et le
contenu avant de cliquer sur un lien ou d'ouvrir un document.
Hi Patrick,
that’s odd … I think I didn’t change anything with respect to the decoding of
datatypes. A quick look showed me that it has been mostly unchanged since
before the last release.
The only changes I did there were fixing some character and string handling
issues. So, I guess your problem must have a different source.
Next to the automated tests, we also have the “ManualTests”, which can only be
executed if you possess an ADS device and declare a pre-defined datastructure
and values.
One of the tests is this:
test.addTestCase("MAIN.hurz_DINT", new PlcDINT(-242442424)); So, this test
reads the variable hurz_DINT from the plc and compares it with the expected value, then
it writes it back.
If the writing wouldn’t be working, I probably couldn’t execute the test more
than once. However, I am perfectly able to do that.
Do you have an idea what could else be causing this problem you are having?
Could you please share with us, the exact type of your PLC?
I could ask my folks at Beckhoff to what the problem could be.
Chris
Von: Patrick Boisclair <[email protected]>
Datum: Dienstag, 17. Oktober 2023 um 03:03
An: [email protected] <[email protected]>
Betreff: PLC4X - 0.11.0 - Issue writing value to a Beckhoff PLC using ads
driver Hi all,
I upgraded from version 0.9.1 to 0.11.0 and I cannot write to my Beckhoff PLC
anymore.
When I write 1 to a DINT, 16777216 is stored.
Is it a BIG-ENDIAN vs LITTLE-ENDIAN issue ?
Is it possible to specify the “endianness” of the PLC ?
According to the TWINCat doc, it seems they use LITTLE-ENDIAN.
Any information would be grateful.
Thank you very much and best regards.
Patrick Boisclair
Analyste Programmeur Sénior, Automatisation ‑ IoT Senior Analyst Programmer, Automation ‑ IoT
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