Step 7 V5.5 - Dynamically Changing Configured Connections

We are working on a project in which a few CP343s will be communicating with several hundred other S7-300 CPUs. It seems like NetPro only lets you configure a certain number of connections per CPU. Would there be a way to dynamically change the target IP address, in order to reuse the connections? The SP343 is the Active partner and we are just using Get/Put. We only need to communicate with the remote CPUs once every few hours or few days, so there isn't a need to be connected to all of them at once.

Actually I think I just found it (which is what always happens after you ask a question ), it looks like FB55 IP_CONFIG can dynamically modify the Connection Table.

The Cpu and the Cp both support a number of connections. If it is the cpu that is the limiting factor then you can aggregate many connections via the cp by activating "connection multiplexing".

I've knew you could use IP Config to change the IP address of the card, I never knew it could also change the settings of each connection. That's very interesting, very useful, and a little bit scary.

The way I've solved that in the past is using TSEND to send raw TCP data. These connections can be programmed right at the block, instead of having to be predefined in the HW config. This means that even though there is a limit on how many can be active at one time, I can take turns talking to different devices. However, it only works if you're using some of the newer CPU's.

The TCON TSEND TRECV TDISCON blocks only work with an integrated PN port.

Good point. Is AG_send/recv the equivalent in the CP's?

mk42 said:

Good point. Is AG_send/recv the equivalent in the CP's?

Click to expand...

Yes.
AG_SEND/AG_RECV via a CP can exchange data with T_SEND/T_RECV via an integrated PN port.