Communication “Modbus RTU” VFD NE-200 Control Techniques with SIEMENS S7-1200

In this article, I will guide you to connect and communicate Control Techniques VFD with PLC Siemens S7-1200 through Modbus RTU protocol.

For S7-1200 to communicate with your NE-200 VFD , use module S7-1200 CM1241 6ES7241-1CH32-0XB0

The connection diagram Modbus RTU between NE-200 with Siemens CM1241

Please connect the wires as below, pay attention if the communication is longer than 100m, you need to use a 120Ohm terminal resistor.

Install with NE-200

For the default parameters, and the engine parameters you set, we need to pay attention to the parameters of the communication below.

• Fd.00:1

• Fd.01:2(Tùy vào địa chỉ các bạn muốn dặt cho biền tần)

• Fd.02:3

• Fd.03:0

• Fd.04:10

Register List NE-200(Register List)

For Modbus S7-1200 communication we need to add 1 value to the address area of NE-200: PLC ADDRESS = 400001+ NE-200 ADDRESS.

400002=400001+1(1H): VFD command:

• Value equals 1: Running forward.
• Value equals 2: Reverse run.
• Value equals 3: Stop.
• Value equals 4: Free stop.
• Value equals 5: Reset error.

400003=400001+2(2H): VFD Command Hz :

400033=400001+32(20H): VFD status.

400034=400001+33(21H): VFD fault status.

400035=400001+34(22H): VFD status.

400036=400001+35(23H)….: Parameters such as motor current and voltage that you can read up

Configuration PLC S7-1200 and CM1241

Program S7-1200

1. Configure Modbus Load

2. Frequency setting

3. Run stop command setting

4. Read VFD frequency

Above is a guide on how to connect and communicate between S7-1200 CM1241 and Control Techniques NE-200 VFD. Hope the article will be useful to you. Thank you!

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#MODBUS RTU #S7-1200 #SIEMENS #CONTROL TECHNIQUES