S7-1200 HTTP Request

edda · Aug 17, 2014

Hi all!

Would it be possible to make a http request (GET) from a Siemens S7 1200?
I would like to call a web API on a server (port 80) once every minute.

Best Regards

Edmund

mk42 · Aug 17, 2014

In addition to the built in protocols, the 1200 supports open socket communication via the t_send/t_recv commands. You can send/receive any tcp/udp data you want, but you need to parse the protocols yourself. There is not a pre-defined block for http get requests, but maybe someone on here has done it before?

The 1200 should definitely be able to support sending/receiving the request once a minute, the trick is writing a block to understand the web API.

I'll also add, for the record, that I'm hoping this is a private web server, and that you are not connecting the PLC directly to the internet. PLC + internet = hackers galore, in case you weren't aware.

edda · Aug 18, 2014

mk42 said:
In addition to the built in protocols, the 1200 supports open socket communication via the t_send/t_recv commands. You can send/receive any tcp/udp data you want, but you need to parse the protocols yourself. There is not a pre-defined block for http get requests, but maybe someone on here has done it before?

The 1200 should definitely be able to support sending/receiving the request once a minute, the trick is writing a block to understand the web API.

I'll also add, for the record, that I'm hoping this is a private web server, and that you are not connecting the PLC directly to the internet. PLC + internet = hackers galore, in case you weren't aware.

Hi mk42.

Thanks for your reply.

I will look in to the t_send/t_revice function, I´ve been doing the same thing with codesys and the use of OSCAT network library, but I have not been able to find some similar library for S7-1200.

So if anyone knows about and premade blocks that exists please let me know

The API is a closed internal function, and we are only sending the status of a Digital input into the API.

BR.

Edmund

S7-1200 HTTP Request

edda

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mk42

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edda

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