Siemens S7-1500 PLC JSON RPC Web API - Integrating Control Systems to Higher Level Systems with HTTP

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In this video we discuss and take a look at one of the cool features of the V2.8 Firmware for the Siemens S7-1500 Family of Programmable Logic Controllers.
The firmware contains a JSON-RPC Web API allowing you to connect to the web server of the PLC over HTTP and read and write from the control system using correctly formatted JSON strings.
00:00 Introduction, why a Web API in a PLC, and technology overview
02:31 Configuration of the Web API inside of TIA Portal
04:20 Testing the PLC Web API using Postman testing tool
07:00 Example dynamic graphs drawn using JavaScript XHR Requests to Web API
08:20 Wrapup
Check out the JSON-RPC spec here: www.jsonrpc.org/specification
Check out the supported PLC API function in the system manual: support.industry.siemens.com/...

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5 авг 2024

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Комментарии : 47

@mohamadismailbasha6083 Год назад

Thanks a lot for the effort put on this video.

@user-ek4vj1ch2k 10 месяцев назад

very nice

@juritihonov8336 3 месяца назад

thank you

@jeesantony5308 10 месяцев назад

thanku....

@hennero.3826 Год назад

That seems to be exactly what I was looking for! I am not a PLC expert, instead, I am woking in an IT department using Oracle databases and we implemented an MES system a few years ago using OPC to retrieve data from the PLCs. To do this, we attached a small OPC server with each PLC and connected the MES software via OPC protocol to these OPC servers. Now, with what I just learned from your video, it seems like these built-in features of the S7 1500 make OPC servers obsolete if I have the means to do JSON requests from the database side (which Oracle can do via PL/SQL, of course). Am I getting this right that connecting directly to the PLCs web server/service and using JSON requests can be used instead of OPC and basically can do the same job?

@naumanali8357 2 года назад

Nice initiative I love this technology I am a Full Stack javascript developer and passionate to learn how to connect the plc to decentralized apps. please share some more resources regarding this

@talbizakaria6044 Год назад

Please if worked or still working on this project contact me.

@HzHzhKrm 3 года назад

What max data rate may be achived in this system?

@leominlat Год назад

Hi , how about S7 controller is client , can access and exchange the tags with any web server ?

@ledamns 9 месяцев назад

I'm just entering the world of JSON and PLC and I have a question. What would be the process to read the data from the WED to the PLC and with it generate other values and thus send them again? What type of variables would they be stored in the PLC? Sorry if it's an obvious question. Thanks for the video

@gajarubanjeyakumar7226 3 года назад

Do u mind sharing the sourcecode?

@sakkarinvaiprasert9797 3 года назад

What is a TIA version do you use? And it can work with S7-1200 ?

@AutomationStation 3 года назад

EDIT: As of V4.5 Firmware of S7-1200 and TIA Portal V17 this feature is also functional in S7-1200

@christianpfoertsch 2 года назад

With V17, also S7-1200 supports this feature 😀

@SarelJansevanRensburg-de9hx 3 месяца назад

Hi, I followed the exact same steps to get a token from a S7-1500 PLC using Postman. When the PUT request is sent, I get a response from Postman Status "405 Method Not Allowed". Not able to get the token and send requests to the PLC from Postman. Please assist?

@Persojet Год назад

Is it possible otherway around? Getting data from API to the PLC?

@AutomationStation Год назад

Sure, there are some http instructions available for GET and Post calls: support.industry.siemens.com/cs/document/109780503/

@olegmalinovskiy982 Год назад

Hi, It's looks really nice, can you share please chart page?

@juangonzalezsimoes1305 3 года назад

Great video! Very interesting I am working on a project to make a POST on a REST API server with JSON from a Siemens PLC. Is this possible with an S7-1500 PLC? Thanks for the video

@AutomationStation 3 года назад

Have you seen the LHttp library? It has a POST block ready to use. support.industry.siemens.com/cs/document/109763879/

@ishouldbeonmountrushmore8156 2 года назад

@@AutomationStation I am always getting a 8089 error. do you know why that is ?

@talbizakaria6044 Год назад

Please if u still working on this project contact me.

@talbizakaria6044 Год назад

Because I'm also in the same situation now.

@engineeringart8502 2 года назад

Is it possible to send data from SCADA using JSON?

@AutomationStation 2 года назад

What SCADA platform are you working with? If you are using WinCC then using the built in S7 drivers are the best choice.

@Max-dc6if Год назад

Is it possible that you share the html files that have been deployed to the plc? I'd love to make a WebApp out of it and deploy that one in run as another example of what can be done with the s7-1500 Web API - of course only if that'd be fine for you.

@vipinmanikkara Год назад

hi, did you rcv the source code ?

@Max-dc6if Год назад

@@vipinmanikkara Nothing so far.

@ashiqmumtaz8726 3 года назад

Can you please share the project files?

@user-pi9br3vx2i 2 года назад

hello！I'm using 1200, firmware library 4.5.0. I'm curious why your response is so fast, it's done in milliseconds. however I need a few seconds。if I use lhttp,its fast like yours .Thank you

@christianpfoertsch Год назад

Hpw ,amy API requests do you send? Are you using JSON-RPC Bulk-Requests to minimize the HTTP and TLS load? S7-1200 though is slower than S7-1500

@joga_bonito_aro 2 года назад

Its not really RPC though to be honest. RPC means remote procedure calls. In other words, it means that you can call functions remotely. You may be able to call predefined functions via a remote PC, but you can't really implement your own. Unlike TwinCAT 3, which actually implements real RPC, you can't call functions or function blocks remotely, due to the fact that it does not implement the IEC 61131-3 standard. The IEC 61131-3 actually allows you to have a somewhat modern high level programming language. Function blocks can have methods, which in return, can be called via the RPC protocol. Just my two cents. I find it rather misleading calling this RPC.

@AutomationStation 2 года назад

It isn't being advertised as RPC, the name of the protocol which is being used is called JSON-RPC www.jsonrpc.org/

@marc2752 Год назад

i fucking hate my job

@saisumanth6663 2 года назад

Permission denied

@christianpfoertsch 2 года назад

Have you authenticated using Api.Login and have you also passed the session token with the API calls?

@davidschumaker5133 3 года назад

Thanks for the informative videos. I keep getting a '400 BAD REQUEST' when i try to connect. I have everything set as shown in the video but i never get a response back. I am using a S7-1500 1515-2 PN CPU. I have configured the webserver and added a user with the same name and password that you used. the only thing I'm unsure of is the id number. Any help is appreciated. Thank you.