Siemens Simantic Net NCM for Industrial Ethernet S7 - Manual (Page 57)

Installing and Starting the Ethernet CP with STEP 7
57
SIMATIC NET NCM S7 for Industrial Ethernet
C79000-G8976-C129–06
Table 2-1 Settings in the “Options” Tab , continued
Option Meaning / Effect
S
Individual Network Settings Here, you can make fixed network settings, when necessary. As
default, “Automatic Setting” is selected and this setting generally
guarantees problem-free communication in most situations.
If problems occur in communication (for example, when connections
are not established or when there are often disturbances on the
network), the reason may be that the selected or automatic network
settings are not suitable. You can then select a network setting to suit
your network configuration.
S
Send Keepalives for
Connections Here, you can set the interval at which keepalives are sent to the
partner of a communications connection. This setting decides the
latest time after which the failure of a communications partner is
detected.
For all connection-oriented services, the Ethernet CP is configured so
that keepalives are sent. This guarantees that connections are
closed if a communications partner fails and that the connection
resources are released. The setting made here applies to all TCP
and ISO-on-TCP connections operated via the CP; a
connection-oriented setting is not possible.
Possible values:
Default Setting: 30 seconds
Turn keepalives off: 0 seconds
Maximum value: 65535 seconds
Notes / Recommendations:
Remember that the keepalive mechanism can keep underlying
connections established (for example, an ISDN telephone
connection) although no user data are actually being transmitted. If
this is not required, set the interval so high that the underlying
connection is closed down when no further user data are sent before
a keepalive is sent.