To use ExcelLink, A PC must be running the TLServer program and connected to the PLC. However, ExcelLink software can be running on a different PC but linked to the same network. ExcelLink incorporates our PLCmon.jar API library which enable it to talk to a remote TLServer on the network and the TLServer in turn relays the messages to the PLC via RS232 port.
In other words, TLServer acts as a TCP/IP gateway for the PLC. If you wish to permanently connect the PLC to the network without having a PC running TLServer 24/7, then you can purchase the optional Ethernet XServer which take the place of the PC + TLServer.