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To send and receive data on Master side we need to use 2 channels:

• Write Multiple Registers (Function Code 16)
• Read Holding Registers (Function Code 03)

Step 1. Modbus Slave Channel - Add channel - FC 16 - Length 10

To send or write data we need to use channel 0 with access type Write Multiple Registers (Function Code 16).

Since we have decided to use approximately 8 variables, the length will be set to 10 (this value can be changed).

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Step 2. Modbus Slave Channel - Add channel - FC 3 - Length 10

To receive or read data we need to use channel 1 with access type Read Holding Registers (Function Code 03).

Since we have decided to use approximately 8 variables, the length will be set to 10 (this value can be changed).

NB! We need to change Offset from 0011, because of values from 0 to 10 are allready assigned to Channel 0. 

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All mapping we can do at ModbusTCP Slave I/O Mapping.

Step3.