errormessage b'CPU : Item not available' when using get_cpu_info()

[smar2022]

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]

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]

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

[swamper123]

Just see #323 had a similar Problem (and I haven't answered 😅 ).
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]

OK, THX.

[gijzelaerr]

Closing as resolved -- this is a known limitation of S7-1200/1500 PLCs. Basic read/write operations work fine; some SZL info functions are not supported by these models. See also #323.