Configuring Hardware and Communication Connections STEP 7.pdf

Properties of cross-project connections
Tip
Working With Projects in the Multiproject
Consistency of cross-project connections is maintained when projects of a
multiproject are handled. Cross-project connections within a multiproject stay fully
operational a can be compiled, even if the project that contains the connection
partner is removed from the multiproject.
The following applies to STEP 7 connections: STEP 7 prompts you to split the
connection before the properties dialog pops up only when you call this dialog to
view the connection properties. You can only modify the connection properties
after you have confirmed this prompt with "Yes". You must adjust the connection
properties manually when you change the properties, same as with S7 connections
to an unspecified connection partner. Whenever you change connection properties,
there is a risk of malfunctions during runtime.
Only the local ID for a connection can be changed without terminating the
connection.
Fault-tolerant STEP 7 connections cannot be terminated.
STEP 7 uses the S7 subnet ID - an object property of a subnet - to adjust crossproject
connections.
When you attempt to configure cross-project connections without having merged
both of the corresponding subnets (which are to form the connection path), for
example because other, similarly affected projects are temporarily unavailable, you
can help yourself in the following way:
Adjust the S7 subnet ID at all subnets. Select the respective subnet and view its
object properties via the context-sensitive menu. Enter identical S7 subnet IDs for
both of the subnets.
You can then specify that the nodes on "manually adjusted" subnets of the other
project form the connection end point. However, this process still does not confirm
the uniqueness of individual subnets from the viewpoint of NetPro. The consistency
test would report an error if the projects are connected through a common, crossproject
subnet. In this case, the same subnet IDs in different projects will be
detected and recognized as errors.
For this reason, merge the subnets in NetPro.
Configuring Hardware and Communication Connections with STEP 7
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