Hello Ivanivna;

Your message was incomplete, you should at least tell us what CPU, HMI and software you wish to use for your project.

If you wish to use an MP3 Player on a Comfort panel with WinCC Comfort, you could be interested in the following discussion:

Play sound via script

Hope this helps, 

Daniel Chartier 

Hello.

Іванівна

Good day. Help beginner. I need to accompany the process by voice messaging. To do this, I use the CPU 1214C (DC / DC / RLY), CB 1214 (V1.0), MP3 player (the module connects to the control electronics via the UART). How do I install a CPU connection with MP3? I would be grateful for any help.

Am I correct? ->
You aim: Communicate an MP3 player with an S7-1200 PLC.
Hardware link is going to be RS485.

The specification of the MP3 player you are using is important. The manual of the MP3 player will specify how the communication characters or protocol should look like. If you provide more detail, someone might be able to show you the right direction.

Cheers.

Hello!

CPU 1214 must control (select audio file) by audio through CB1241 / RS4485. I do not use HML. Reference to mp3 module documentation

https://www.compel.ru/item-pdf/abd680ff3d5360de7b377065585ba3ae/pn/dfrobot~dfplayer---a-mini-mp3-player.pdf

Thank you! 

Hello

perhaps this TOpic describes a similar usecase:

https://support.industry.siemens.com/tf/ww/en/posts/how-to-connect-s7-300-with-sensor-output-uart-signal/69742?page=0&pageSize=10

Bye Murof

Hello Ivanivna.

Іванівна

Hello.
 To select a song, I will create commands according to the mp3 documentation. That is the way
Our instructions are given in support of the specified track is playing, the song selection ranges from 0 to 2999.
 Actually can support more, because it involves the reasons to the file system, support for the song too much, it
 will cause the system to operate slowly, and usually the application does not need to support so many files. If
 the customer has unconventional applications, please communicate with us in advance.
 1).For example, select the first song played, serial transmission section: 7E FF 06 03 00 00 01 FF E6 EF
 7E --- START command
 FF --- Version Information
 06 --- Data length (not including parity)
 03 --- Representative No.
 00 --- If need to acknowledge [0x01: need answering, 0x00: do not need to return the response]
 00 --- Tracks high byte [DH]
 01 --- Tracks low byte [DL], represented here is the first song played
 FF --- Checksum high byte
 E6 --- Checksum low byte
 EF --- End Command 

But how to transfer these commands, with the help of which function ???

What you are looking for is 'point-to-point' (PTP) communication. You will be sending ASCII characters. Have a look at https://support.industry.siemens.com/cs/ua/ru/view/89674023/en

Have a look at the in-software help to get more information. An expert such as Mr. Duris should be more than able to assist further.

Good luck.