[BUG] -

[AndrewStuhr]

While trying to read tags out of a 1756-L83E/B, the following error occurs:

Traceback (most recent call last): File "deviceTags.py", line 3, in with LogixDriver('192.168.96.2/0') as plc: File "C:\Program Files\DAQuery\webserver\venv\lib\site-packages\pycomm3\clx.py", line 170, in init self._micro800 = self._list_identity().startswith(MICRO800_PREFIX) AttributeError: 'NoneType' object has no attribute 'startswith'

Here is the code

from pycomm3 import LogixDriver

with LogixDriver('192.168.96.2/0') as plc:
    print(plc.tags)

The version of pycomm3 we're running is 0.8.1, the reason being that newer versions return results that aren't JSON serializable.

Apologies if this issue has already been fixed, I didn't see any previous submissions regarding this issue.

As always, thanks for the wonderful library!

[ottowayi]

hmm that's weird, it's hard to tell without more context/logs. The current code looks a bit different now, so it may have been fixed.

Is it the plc.tags that isn't json-serializable? because there is the plc.tags_json property that should be. I would recommend updating and trying that first.

[AndrewStuhr]

I'll try again with the most recent pycomm3 versions and report back.

I'll also try out plc_.tags_json - thanks!

[AndrewStuhr]

There was no issue reading the PLC using pycomm3==1.2.14, and the JSON tags worked great. Thanks!