Hello, 

simonq992

I have another question about sending data from Hercules. I figured out that data are not sent until Hercules not filled all bytes in buffer. Then function in PLC can see this data in buffer. I read help and when i am using optimized DB it should works without LEN parameter. This situation is stange for me.See in attachment.

I will send second screenshot in next post.

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Split from TCP connection with Hercules (PLC as passive).

this isn't Hercules functionality but system how to recognize end of data stream on Siemens side. I recommend carefuly check general problematic of TCP/UDP and on TIA also check of AdHoc option. Without AdHoc option set you can have data presented only after fill of complete receive buffer so this is right feature for you. One important addition, your post missing important HW cfg used so there can be problem in case of different HW CPU used than supported AdHoc feature.