Lenze PC-based automation - Manual (Page 53)

DMS 1.3 EN - 02/2011
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53
Control technology| System manual
Appendix
Basics of the OPC standard
8.1.4 OPC tunnel
If an OPC server and an OPC client are located on different computers, OPC tunnels are
used. This is a software which is installed on both computers and acts as client and server
itself. The data is transferred between the OPC server and OPC client by the OPC tunnel via
the TCP/IP protocol. Thus, OPC tunnels provide a platform and network-spanning commu-
nication of OPC-based applications. This serves to avoid the "conventional" communicati-
on of distributed client/server applications via DCOM.
OPC tunnels are mainly used to connect the Engineering PC with the Industrial PC. Howe-
ver they can also be used in connections between the Industrial PC and other computers.