5 Configuring Communication Connections
A-155
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
Figure 5-25 Configuring FETCH PASSIVE Based on the Example of an ISO Transport Connection
The connection can then only be used for this mode; sending or receiving with
the FCs AG_SEND/AG_LSEND or AG_RECV/AG_LRECV is then no longer
possible.
The connection is established passively; in other words, only the partner station
(SIMATIC S5 station, a PC station, or a non-SIMATIC station) can establish the
connection. The setting is made automatically in the “General” tab and cannot
be changed.
Notice
Remember that with this configuration on an S7-300, one connection resource
(free connection for S7 functions) of the S7-300 CPU is used. CPU connection
resources are also used, for example, by S7-300 CPs, in the FMS mode or by
PGs and OPs. For more detailed information about the maximum connection
resources, refer to /1/.
SIMATIC PC Station: FETCH ACTIVE / WRITE ACTIVE
If you select the FETCH ACTIVE or WRITE ACTIVE mode for the ISO
transport connection, you can access the system areas on a SIMATIC S7 PLC
or a SIMATIC S5 station from the PC station.
The connection establishment is active; in other words, the partner station must
wait for connection establishment (passive connection establishment on the
partner).
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