Hello

I have never worked with modbus. I want to learn modbus, so i bought a AC controller to get started.

Link to AC controller datasheet.

https://www.intesisbox.com/intesis/product/media/intesisbox_pa-ac-mbs-1_user_manual_en.pdf?v=2.1

Can you guys please help me getting startet. I have no clue where to begin. Thank you so much.

Thank you so much.

Any chance anyone could create an simple example project, or tell me which blocks in TIA Portal i need to use?

I dont quite get the addressing. The PLC is the master, and send and address to request another address from the slave (ac controller)?

Then what address should i send to the slave?

Garrianz

I dont quite get the addressing. The PLC is the master, and send and address to request another address from the slave (ac controller)?

Then what address should i send to the slave?

 Helo Garrianz;

Start by reading smiffy's Modbus General Description document as proposed by Kaulquappe earlier, it may help you clarify the requirements for Modbus RTU communications.

Each slave on the Modbus network muist be attributed a node address by which the master can recognize it and exchange data with it. Depending on the slave, there are different ways to attribute this address, through software or DIP-switches, for example.

Once the node address is given,the master must request data from each slave. The mechanism is detailed in the following application example, including how to read a Modbus register mapping provided by the slave's manufacturer (to know what data you need in the master) and how the master uses Mode and Modbus functions to read or write to specific registers on the slave.

Controlling a fan (ebm-papst) via Modbus RTU using the SIMATIC S7-1200

https://support.industry.siemens.com/cs/ww/en/view/109476801

The links at the bottom of the page are to manuals and FAQs on Modbus RTU with the S7-1200, they can help you understand the functions that control the data exchange.

Hope this helps,

Daniel Chartier

I like this link for an overview of Modbus, its history and how it differs from Profibus, then you will have a foundation to help you understand the other readings and examples mentioned in this thread.

Thank you so much.

But i would very much apreciate if anyone could create a very simple project for turning the AC on or off. I want to the all the addressing etc in the correct intructions in the TIA Portal.

 Hi Garrianz,

What I would suggest is that, if you want to learn, you should start adding the Blocks in TIA. If you are using Modbus RTU, then you need extra module added to your CPU. If you are using TCP, then it is just about adding MB_Client instruction in your program and setting it up.

Instead of waiting for the sample project prepared by someone, just start to do some instructions which experts had shared in the previous replies. Get started and when you are struck or getting some issues with instructions come back here. The best part of learning is that get started and troubleshooting. Which will help you to understand each and everything .And advantage of this is that you will never forget it. Unlike the sample project , then every time when you wanna configure, you need to look in the sample project. In my opinion this is not much of learning involved.

Just my opinion. Just ignore it if you don't feel good about it 

Thanks,

Jay

Garrianz

Thank you so much.

But i would very much apreciate if anyone could create a very simple project for turning the AC on or off. I want to the all the addressing etc in the correct intructions in the TIA Portal.

Kal.A

Which version of TIA portal do you have?

 I have v13 sp1 :)