An HMI has a built-in Modbus TCP/COM Mapping Table, which allows the HMI to act as a Modbus Slave for a Modbus Client to read. Another HMI can use a Modbus TCP/IP driver to read the data.



For example, to exchange data between HMI-A and HMI-B:

(1) For HMI-A, which uses the built-in Modbus TCPIP Mapping Table, no extra settings are needed.



(2) For HMI-B, add a Modbus TCP/IP driver in the Communication Settings. Enter the remote HMI-A’s IP in Controller IP to read its register data.