Hello,

I have a CPU 412-2DP with CP 443-1 and a CPU 315-2PN/DP  connected together through a switch via ethernet. I want to send a small amount of data to cpu 412. Which is the best way to communicate via ethernet, can you please help me? 

Hello Naldi;

We need a bit more information to help you out:

- first, which model (par t number) is your CP 443-1? A CP 443-1 Advanced can be a Profinet IO Controller, other models can only act as a Profinet I-Device.

- also, what software are you using to program your application, the examples we can provide will differ if you are using Step 7 v5.x rather than TIA Portal Professional (add the version you are using).

Basically, there are many ways to connect these PLCs over Ethernet; mostly choices are governed by the amount of bytes you want to exchange, and the speed you need to transfer the data.

. The easiest (less programming) ways are:

- Profinet IO Controller to I-Device.

-S7 Communication (PUT/GET functions).

The following document will provide a resumé of available communication links available to all S7 CPUs, so you can start your search and get basic information:

CPU-CPU Communication with SIMATIC Controllers

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

Hope this helps,

Daniel Chartier

naldi

I have a CPU 412-2DP with CP 443-1 and a CPU 315-2PN/DP  connected together through a switch via ethernet. I want to send a small amount of data to cpu 412.

So many ways to do this.

1. S7-300 as Profinet I-Device

2. PUT/GET

3. BSEND/BRCV

4. TSEND/TRCV

5. Something else

Dear Daniel, 

thank you.