What is the meaning of the red cross in the Navigator window of
the OPC Scout?
The OPC client of SIMATIC Net (OPC Scout) provides the option
of using the OPC Navigators to browse the address space of an OPC
Server. Here, you get a display of the variables known to
the OPC Server, i.e. which exist in its address space. If no
variable has been defined as yet, then the corresponding icon is
crossed out in red. You can define variables manually via "New
Definition". These "Items" are entered in the address space of the
server. When the OPC Server is connected again, these variables are
then known and the red cross disappears. This is not an error but
just the fact that there are not (yet) any variables known to the
The address space of an OPC Server is a hierarchical list of
variable names. However, this does not mean that they can
also be added (AddItems) or "productized". The syntax check of a
variable is run only when the "AddItems" call is made.