B3L−51; Special Features Of Ip Configuration; Reserved Port Numbers - Siemens CP 343-1 User Manual

S The connections on which a job on the communication bus with a data length >
240 bytes is being processed are aborted temporarily.
S FETCH/WRITE connections are temporarily aborted.
On the FC interface in the user program, the condition codes made up of the
DONE, ERROR and STATUS parameters must be evaluated in FC11 / FC12.
9.6

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.
9.7

Reserved Port Numbers

The following local port numbers are reserved; You should not use these for other
purposes in the connection configuration.
Table 9-1
Protocol
TCP
TCP
TCP
TCP
TCP
UDP
UDP
UDP
UDP
UDP
UDP
CP 343-1 Lean for Industrial Ethernet / Manual Part B3L
Release 03/2007
C79000-G8976-C198-04
Reserved Port Numbers
Port number
20, 21
25
80
102
135
161
34964
65532
65533
65534
65535
9 Further Notes on Operation
Service
FTP
SMTP
HTTP
RFC1006
RPC−DCOM
SNMP_REQUEST
PN IO
NTP
NTP
NTP
NTP
B3L−51