ModbusTCP Server Setup

Video Tutorial

Server Setup Steps

Step Action
1

Open the Internal FEnet settings.

2

Setup FEnet parameters.
3

Choose Modbus Server or Smart Server as the Server Mode.
4

Press Modbus Settings button to configure memory address space for the server.
5

Configure Modbus Settings with appropriate memory addresses.

 

For this application example, ModbusTCP communication requires the following:

  • 1,008 bits (read)

  • 1,008 bits (coil)

  • 1,000 words (read)

  • 1,000 words (hold)

Note: Memory blocks of 1,008 and 1,000 are chosen as an example only. You can choose any memory block size for your needs.

Step Action
1 Choose the direct memory area in the LS PLC. In this example, the M memory area will be used. The user can choose the W area or a combination of both.
2

Determine the blocks of registers that will be used.

  • 1,008 bits (read) è%MX3216 - %MX4223

  • 1,008 bits (coil) è%MX6416 - %MX7423

  • 1000 words (read) è%MW600 - %MW1599

  • 1000 words (hold) è%MW1600 - %MW2599
3

Enter the starting registers of each Modbus area (red above) in the Modbus settings window.

*Note: Bit area must use Bit data type address.
4 Select Ok

Mapping will be as the chart indicates.

 

 

LP201-1