Application of modbus TCP in hmi

1. The application layer of WECON HMI makes use of Modbus TCP, which makes industrial Ethernet data exchange achievable.

2. It''s easier to interconnect with different systems: available to management network, real-time monitoring network and field devices communication.

3. Low cost of network''s implementation: available to apply a common network component.

4. High data rate: high transmission capacity, the transmission result of 100M Ethernet is 4000 Modbus TCP messages per second, while each message can transfer 125 words, which is equivalent to 4000×125=500000 analog data (8000000 switch).

Ⅱ. Parameter Settings

The case here PC is set as Slave(lower computer), and touch panel as Master(upper computer).In this way, PC can communicate with HMI.

The IP address of PC is set: 192.168.1.2. The two screens of project is edited by the use of WECON configuration software, the device type of one is chosen ModBus TCP Slave, the other is ModBus TCP Master.

The project of Slave is downloaded to HMI and Master''s is simulated online.The network of HMI and PC are connected by communication cable.

* Setting of HMI project

The setting of communication port configuration:

The communication port is selected Ethernet and device type is ModBus TCP Slave. The Ethernet parameter is set: 192.168.1.2:502(this IP address should be the same to PC''s). The network type is set: TCP_Client_2N. The setting is as shown in figure 1.