Siemens SIMATIC NET CP 343-1 User Manual
9 Further Notes on Operation
B3L−51
CP 343-1 Lean for Industrial Ethernet / Manual Part B3L
Release 03/2007
C79000-G8976-C198-04
C79000-G8976-C198-04
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.
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.
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.
purposes in the connection configuration.
Table 9-1
Reserved Port Numbers
Protocol
Port number
Service
TCP
20, 21
FTP
TCP
25
SMTP
TCP
80
HTTP
TCP
102
RFC1006
TCP
135
RPC−DCOM
UDP
161
SNMP_REQUEST
UDP
34964
PN IO
UDP
65532
NTP
UDP
65533
NTP
UDP
65534
NTP
UDP
65535
NTP