There is a picture that i got in the internet as follow, which is basic of my mind. And it is that KUKA.OPC server allows access to the I/O's of OfficeLite. ProConOS is the system of SoftPLC. And I contacted to KUKA simulation department, then they gave me the information that KUKA.OPC server can be installed in the OfficeLite, but they cann't make sure ProConOS is needed to be installed to support the KUKA.OPC server. So, I post the information and hope to get your suggestion. thanks in advance.