Hello;

In your description, you do not mention the use of a IE CP343-1? To setup a CP 343-1 as an IO Controller (note: a CP 343-1 Lean cannot work as IO Controller) or IO Device, you must use the special functions PNIO_SEND (FC11) and PNIO_RECV (FC12), You will find these blocks  in the "SIMATIC_NET_CP" library of the S7-300 controller.

 See this document for information:

https://support.industry.siemens.com/cs/ca/en/view/31764614

If you are using the Profinet integrated port of the S7-300 as an IO Controller, this article shpwws you an example of the required settings :

https://support.industry.siemens.com/cs/at/en/view/109476499

Finally, you cannot exchange I/O bits between partners with Profinet or Profibus-DP. The smallest amount of data you can exchange is a byte. 

Hope this helps,

Daniel Chartier

Hello,

eeeehm I don't understand exactly what I/O areas you've defined, pls share that Definition table from S7-1500 to see that areas with addresses. To my opinion you do basical mistake probably, your set of signals are overwrited with S7-1500 side probably. Your logic is only copy signal to output from input state and this can be also problem. On S7-1500 side I expect you you have simply copy outputs from S7-300 to S7-1500 inputs and vice versa, I mean from S7-1500 output Q is set to that I46/48 on S7-300. This simply set your state wrongly. If you don't have any logic on S7-1500 side then you need set manually your Q on S7-1500 to take effect but then your logic looks to me somehow not logical because at that time your S7-300 is maybe on 0 state and this simply overwrite your S7-1500 signal again. Try to imagine data flow with correct used output signals type. This is your problem probably.

Look, to do force of your inputs looks to me not logical and can also point you to confusion, work only with outputs and don't force inputs that are outputs from other side of network.