Hola muy buenas tardes.

Necesito comunicar un PLS S7-300 con un equipo siemens de control de combustion, tengo los datos del equipo y la forma de comunicarlo como esclavo, quisiera saber que instrucciones o de que manera me puedo extraer la data de este equipo para mostrarla por medio del S7. Estoy usando el TIA portal 14 y tengo una tarjeta CP341. Gracias...

 Translation from the Spanish text:

nomolina

Hello, and good evening;.

I need to communicate between a PLC S7-300 and a Siemens combustion control equipment. I have the technical data of the equipment and I know how to communicate with it as a slave. I would like to know what instructions or in which way I can extract the data from this equipment to display it through the S7,

I am using TIA Portal v14 and i have a CP 341 processor,

Hola nomolina; 

Bienvenido al foro de automatisacion  de Siemens.

En el foro particpan miembros de muchos paises, y muchos no hablan espanol. Por eso hemos escogido al ingles como lengua de intercambio para todos.

Por favor hazos la gracia de traducir tus preguntas en ingles la proxima vez que nos visita.

Hello nomolina;

Welcome to the Siemens automation forum.

In this forum members come from many different countries, and many do not understand Spanish. That is why we have decided to use a single interchange language for all, and we have chosen English.

Please do us the favor of translating your questions to English next time you visit us.

Now: you will be using a CP 341 communication processor to communicate with the combustion manager. What protocol will you be using with this serial communication processor, Modbus? and what type of CP 341 do you have: RS-232, RS-485?

It would be easier to provide help if we knew a bit more about your equipment: what CPU and CP 341 will you use (complete part numbers will help), And what exactly is the combustion control equipment in your project (the name and model would help clear things up)? Possibly some here will have experience with this product and can provide helpful hints on communications.

Hope this helps,

Daniel Chartier

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Split from Step 7 Downloads.

Hllo nomolina;

I am unfamiliar with your wise computer, but what would be important is the name of the application running as a Modbus slave on it, and to have details of the Modbus mapping (Modbus addresses used by the Modbus slave, with their definition).

How familiar are you with serial communications (over RS-232) and what do you know about Modbus RTU in general? That would be something to determine as it will impact the learning curve you will face for this project.

I suggest you start by reading this very helpful (and short) document prepared by member smiffyl it has proven enlightening to many members starting or in need of a refreshment on Modbus basics:

Modbus General description

So, your CP 341 (RS-232) must be master on this Modbus RTU link. Siemens' solution uses a downloadable driver that must be certified by inserting a physical donfgle (key) in the back of the CP 341; this dongle enables the Modbus functions on the CP 341. 

The manual below describes the Siemens driver, and the functions needed to program the different Modbus data exchanges 

SIMATIC S7-300/S7-400 Loadable Driver for Point-to-Point CPs: MODBUS protocol, RTU format, S7 is master

Another option is a driver that has been developped by member Tibi68, that does not require a hardware dongle (or the license for the Siemens driver). It is therefore a lot cheaper than theSiemens solution, but you cannot expect any help from Siemens if you get into problem; only Tibi68 is supporting it, as you can see from this link:

MODBUS RTU MASTER FOR CP340/341/441-X (NO DONGLE REQUIRED)

I suggest you study both options before you make a choice, and try not to select only by cost: look at the work you need to put in this program , the support you will need for this project and the amount of support your client might require when he  takes possession of your program.

Please remember to search for the Modbus mapping of the slave application, you will need it when you establish the logic of your data exchanges.

Hope this helps,

Daniel Chartier

Thank you very much for the information, it has been very helpful. I will review it to continue the project. Attach the configuration of the slave so that you can review it and understand me better  Thank you

dchartier

Hllo nomolina;

I am unfamiliar with your wise computer, but what would be important is the name of the application running as a Modbus slave on it, and to have details of the Modbus mapping (Modbus addresses used by the Modbus slave, with their definition).

How familiar are you with serial communications (over RS-232) and what do you know about Modbus RTU in general? That would be something to determine as it will impact the learning curve you will face for this project.

I suggest you start by reading this very helpful (and short) document prepared by member smiffyl it has proven enlightening to many members starting or in need of a refreshment on Modbus basics:

Modbus General description

So, your CP 341 (RS-232) must be master on this Modbus RTU link. Siemens' solution uses a downloadable driver that must be certified by inserting a physical donfgle (key) in the back of the CP 341; this dongle enables the Modbus functions on the CP 341. 

The manual below describes the Siemens driver, and the functions needed to program the different Modbus data exchanges 

SIMATIC S7-300/S7-400 Loadable Driver for Point-to-Point CPs: MODBUS protocol, RTU format, S7 is master

Another option is a driver that has been developped by member Tibi68, that does not require a hardware dongle (or the license for the Siemens driver). It is therefore a lot cheaper than theSiemens solution, but you cannot expect any help from Siemens if you get into problem; only Tibi68 is supporting it, as you can see from this link:

MODBUS RTU MASTER FOR CP340/341/441-X (NO DONGLE REQUIRED)

I suggest you study both options before you make a choice, and try not to select only by cost: look at the work you need to put in this program , the support you will need for this project and the amount of support your client might require when he  takes possession of your program.

Please remember to search for the Modbus mapping of the slave application, you will need it when you establish the logic of your data exchanges.

Hope this helps,

Daniel Chartier