52 NETLink
®
Ethernet Products
10 Troubleshooting
Q: I don’t know the IP address of my computer.
A: Enter the command ‘ipconfig’ after the prompt to show the
configuration of the Ethernet interfaces of your computer.
Q: My computer has a firewall. Which ports must I release?
A: The NETLink-S7-NET driver communicates with the NETLink
®
Gateway via TCP port 7777.
UDP ports 25342 and 25343 are also used to search for the NET-
Link
®
Gateway devices.
Please release at least port 7777 so that the basic functionality of
the driver is available.
If you use the RFC1006 functionality (also known as S7-TCP/IP),
port 102 must also be released.
ATTENTION: If you want to use the driver option ‘Internet
teleservice’ (see Section 5.2.1), the specific ports configured there
must also be released because this port will be used instead port
7777.
Q: Once the configured PROFIBUS slaves have been added on my
CPU, communication between NETLink
®
Gateway and STEP7
becomes markedly slower.
A: The user can influence the allocation of ‘cycle load due to com-
munication [%]’ under object properties of the CPU in the hard-
ware configuration. The default value is 20 %.
Q: When the adapter is plugged on the PROFIBUS, is an online
connection not possible?
A: If an active CPU transmits the bus parameters, it would be ad-
visable for you to activate the auto-baud functionality.
If this is not possible or not desired, check the timing parameters
for the PROFIBUS in the STEP7 project planning. Enter the read
out values into the advanced bus parameter settings with the 'Bus
parameters' button. If online access is still not possible, increase
the parameter 'Ttr' both in the NETLink
®
and in the CPU by a
larger amount.
Make sure you have set the IP address correctly in the driver con-
figuration.
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