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gijzelaerr / python-snap7

A Python wrapper for the snap7 PLC communication library
http://python-snap7.readthedocs.org/
MIT License
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errormessage b'CPU : Item not available' when using get_cpu_info() #353

Closed smar2022 closed 2 years ago

smar2022 commented 2 years ago

Hello,

I allwaysreceive the following errormessage:

b'CPU : Item not available' Traceback (most recent call last): File "C:\Users\smar\Python\Projects\CMAD\firsttry.py", line 169, in main() File "C:\Users\smar\Python\Projects\CMAD\firsttry.py", line 126, in main info = s7.get_cpu_info() File "C:\Users\smar\AppData\Roaming\Python\Python310\site-packages\snap7\client.py", line 161, in get_cpu_info check_error(result, context="client") File "C:\Users\smar\AppData\Roaming\Python\Python310\site-packages\snap7\common.py", line 92, in check_error raise Snap7Exception(error) snap7.exceptions.Snap7Exception: b'CPU : Item not available'

when using the get_cpu_info function. All settings are right (RACK = 0, SLOT = 1, Put/Get access allowed, etc.) I use a S7 1200 FW 4.2 and TIA Portal V17 Can anyone help?

swamper123 commented 2 years ago

Since you receive a legit error from the CPU, it may be the Firmware or a HW config still not set well...

Normal stuff like reading variables works?

smar2022 commented 2 years ago

Yes, things like reading / writing DB´s worksfine. I think the HW settings are correct.

swamper123 commented 2 years ago

Just see #323 had a similar Problem (and I haven't answered :sweat_smile: ). What I know is, that the 1200 and 1500 are not supporting all features.

I am sorry, but atm I haven't got a device on hand to verify this.

Since this doesn't seem to be an Python issue, you may ask at the snap7 directly.. Davide is very helpfull and just use his great work as a python-wrapper. :)

smar2022 commented 2 years ago

OK, THX.