Hello,

I must add some comunications into a big factory, there are a lot of S7-300 CPUs, some of them have embedded Ethernet (314c 2PN/DP), some others are old 313 with CP343-1 Lean Card.

I wanna avoid to configure and transfer any NetPro configuration, this is why I wanna build the communications ID's by using the TCon FB and then AG_SEND and AG_RECV to exchange data. Can I do this in ANY combination of station? Is this working on bot stations with embedded ethernet and stations with CP Lean Ethernet card??

you can not combine TCON and AG_SEND.
And TCON is only for the internal ethernet interface.

Please have a look at the following manual:

https://support.industry.siemens.com/cs/de/en/view/78028908

I suggest you to use the PUT/GET function blocks. you only have to insert an unspecified connection to your master PLC and then you can get data via PUT/GET from your PLCs.

note: from how many PLCs do you want to get data? please have a look at the quantity structure for the connections of your master PLC.