The Communication Between The Pc And Multiple S7-200Plcs - Siemens S7-200PLC User Manual

Of course you can use ES-ETH-PPI to simulate each PLC as a COM port on the PC in order to
achieve the data communication and monitoring operation between PC and multiple PLC s

3. The communication between the PC and multiple S7-200PLCs

When multiple PLCs communicate with a PC via Ethernet, you need to set every ES-ETH-PPI
connected with PLC as TCP Client, set the PC as the TCP Server, let every client ES-ETH-PPI
takes initiative to connect the server PC. When VCOMM Virtual Serial Port Software work as TCP
Server,it allows unlimited number of connected clients.
Set the ES-ETH-PPI network parameters, the gateway of ES-ETH-PPI,PC and router must be
same, the DNS server needn't to be setted because you don't use the dynamic domain name on
the Internet. The picture below is a ES-ETH-PPI setted parameters, when there are multiple
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