Simatic KTP700 Basic HMI and S7-200 PLC Communication Use RS485 Interface

How to communicate Simatic KTP700 Basic DP HMI and S7-200 PLC using RS485 Interface? This post guides you to do it.

Communication KTP700 Basic HMI and S7-200 PLC. What do you need?

To connect KTP700 Basic HMI and S7-200 PLC you need some things:

• The Software:
  • • For HMI device: WinCC V13 or higher. In this post, we use WinCC Advanced Version 15.1 (TIA Portal V15.1) on Windows 10 Pro 64-bits (Version 1903) operating system.
    • For PLC device: Step7 Micro/WIN V4.0 SP9 on Windows 10 Pro 64-bits Version 1903.
• The Hardware:
  • •  Simatic HMI KTP 700 Basic DP.
    • Siemens PLC S7-200 CPU 224
    • RS485 cable (RS232/RS485 Serial Port DB 9pin: 02pcs, cable). You can refer to the post to make a communication between HMI and PLC.

Could be helpful for you:

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Config the connection parameters on the software

On S7-200 PLC Software – Step7 MicroWIN V4.0 SP9

To config on Step7 MicroWIN V4.0 SP9 for connect ktp700 basic hmi and s7-200 PLC please follow the steps:

• Step 1: Click “System block” -> “Communication Ports”.
• Step 2: Set the parameter: PLC Address: 2; Highest Address: 2; Baud rate: 187.5 kbps … See all in the picture below.
• Step 3: Compile the project and download it to the PLC device. 

On KTP700 Basic DP HMI Software – WinCC Advanced V15.1

• Step 1: Create a project and select KTP700 Basic DP. I used HMI Code: 6AV2 123-2GA03-0AX0.
• Step 2: On “Project tree”, click “HMI [KTP700 Basis DP] -> “Connection”.
• Step 3: Create an HMI connection to S7-200 PLC. The communication driver is “SIMATIC S7 200”.
• Step 4: Set the parameters for connecting ktp700 basic hmi and s7-200
  • • HMI device: Type: Simatic; Baud rate: 187500; Address: 1; Access point: S7ONLINE.
    • PLC: Address: 2
• Step 5: Compile the project and download it to the HMI device. With KTP700 Basic you can download the project to the device by using a PROFIBUS/MPI cable or USB Disk. On our blog we guided both methods, you can refer to it.

Previous posts:

• Download HMI Program Via USB Disk in TIA Portal Software
• How to Download HMI Program in TIA Portal Use MPI/Profibus Interface Type

The cable for connection KTP700 Basic DP HMI To S7 200 PLC 

Check the HMI device serial interface, 9-pin sub-D socket, female as below:

Final, we use the connection diagram to make the cable for communication ktp700 basic hmi and s7-200 PLC:

• Pin no 3 of the HMI port to  pin no 3 of the PLC port (Data signal B+)
• No 8 of the HMI port to  pin no 8 of the PLC port (Data signal A-)
• Pin no 5 of the HMI port to  pin no 5 of the PLC port (GND 5V, floating)

Enjoy the result. Now, you can connect, control the S7 200 PLC with KTP700 Basic DP.

If you have any questions about: “Simatic KTP700 Basic HMI and S7-200 PLC Communication Use RS485 Interface” please comment below.

You can refer more about #hmi to plc

Good luck!

-365EVN; Refer: Siemens.com–