Download Siemens S7-400 Technical data

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Special Features of Connections Uploaded to the Programming Device
In the connection table, the connection partner configured offline is missing - the
connection partner is "unspecified." However, address details are available in the
dialog box that follows the properties dialog box.
The communication direction of PTP connections cannot be determined by STEP 7
in every case; but a message informs you of which communication directions are
likely.
If both connection partners are uploaded to the programming device (PG), STEP 7
will then attempt to restore the connections between these partners.
Configuring Hardware and Communication Connections with STEP 7
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