10 Further Notes on Operation
B4A−72
CP 443-1 Advanced for Industrial Ethernet / Manual Part B4A
Release 01/2007
C79000-G8976-C193-06
10.9 Special Features of IP Configuration
Configured S7 connections cannot be operated if the IP address is assigned
over DHCP
Notice
If you obtain the IP address over DHCP, any S7 connections you may have
configured will not work. Reason: The configured IP address is replaced by the
address obtained over DHCP during operation.
10.10 Reserved Port Numbers
The following port numbers are reserved; You should not use these for other
purposes in the connection configuration.
S The following port numbers are used for NTP:
65532 local port
65533 local port
65534 local port
65535 local port
S The following port numbers are used for other services:
20 and 21 TCP / FTP local port
25 TCP / SMTP local port
80 TCP / HTTP local port
102 TCP / RFC106 local port
135 UDP RPC−DCOM
161 UDP / SNMP_REQUEST local port
34964 UDP / PN I/O local port
10.11 Restart after Detection of a Duplicate IP Address in the
Network
To save you time-consuming troubleshooting in the network, the CP detects double
addressing in the network.
When you eliminate the cause by removing the device with the same IP address or
changing its address, you must then restart the CP.
Change the mode selector to STOP and then back to RUN.
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