Hi DJ_1,

I am trying to connect an IoT2040 to a S7 300 via S7 communication.

My problem right now is, that I can not add the IoT to the hardware-configuration, hence I don't know how to establish a S7 connection to the IoT.

I want to read the data from the CPU into the IoT, in order to display the information in Node Red.

Could you let me know how you manage to communicate with your IoT via S7 communication?

Thanks for your aid,

with regards

Athina

You don't need to specify your IOT in the hardware config. You need to allow PUT/GET communication for the plc, so the IOT can GET the values from it. It's like a one-sided communication.

Here is a guide on how to do so with TIA and a PLC S7-1500. I guess, S7-300 shouldn't be that different.

Hello Athin,

Addition to JDaris, In S7300 PLC there in no any GET/PUT access setting.

First you need to follow the procedure as per attached document. You don't have to add IoT hardware  in PLC configuration. 

After installation of S7 Node red in IoT, open the  web ineteface of  node red ( type in browser IoT IP:1880).

Insert the S7 node into flow and configure it as per PLC and its variables.

For example IoT IP is 192.168.200.1 then PLC configuration can be as per PLC type

For S7 1500/1200,

1) Uncheck the “optimized block access” option in properties of the data block.

2.Enable PUT/GET communication in the device configuration of the S7-1500 PLC. Make sure the box is checked (this allows other applications to access PLC).

With the S7 node V1.3.0 you can read DB (DB1,INT0) as well as M memory(MW10)

For S7300/400/200/logo 

No need to configure any thing at PLC side for communication with IoT.