Relevance
ISO transport connections / ISO-on-TCP connections / TCP connections configuration in the parameter group "Properties > General > Options".
How connection establishment affects FETCH/WRITE
Please note the following points for FETCH/WRITE mode:
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For S7 stations:
If you want to use FETCH/WRITE mode (see the "Options" parameter group), clear the "Active connection establishment" option.
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For PC stations / OPC servers:
If you want to use FETCH/WRITE mode (see the "Options" parameter group), enable the "Active connection establishment" option.