Overview Of Connection Resources - Siemens SIMATIC ET 200AL System Manual

Communications services

3.3 Overview of connection resources

The following table shows the protocols that are supported in addition to those listed in the
tables for the S7-1500 communications modules (e.g. CP 1543-1).
Table 3- 4 Layers and protocols of S7-1500 communications modules
Protocol Port number
PROFINET/Industrial Ethernet protocols
Connection-oriented communications protocols
FTP 20 (data)
File transfer 21 (control)
protocol
secureFTP 20 (data)
File transfer 21 (control)
protocol
DHCP 68
Dynamic Host
Configuration
Protocol
Secure NTPv3 123
Network time
protocol
SNMP 161
Simple net- 162 (trap)
work man-
agement
protocol
Special consideration S7-1500 MFP:
Port 111: The S7-1500 MFP uses Port 111 to the NFS service for internal communication.
3.3 Overview of connection resources
Connection resources
Some communications services require connections. Connections allocate resources on the
CPUs, CPs and CMs involved (for example memory areas in the CPU operating system). In
most cases one resource per CPU/CP/CM is allocated for a connection. In HMI communication,
up to 3 connection resources are required per HMI connection.
The connection resources available depend on the CPU being used, the CPs and CMs and
must not exceed a defined high limit for the automation system.
32
(2) Link layer Function
(4) Transport
layer
(4) TCP File transfer
protocol
(4) TCP File transfer
protocol
(4) UDP Dynamic Host
Configuration
Protocol
(4) UDP Network time
protocol
(4) UDP Simple net-
work man-
agement
protocol
Description
FTP is used for the transmission of files (only in con-
nection with CP 1543-1).
SecureFTP is used for the transmission of files by
means of a TSL connection (only in connection with
CP 1543-1).
DHCP is used to retrieve the IP Address Suite from a
DHCP server when starting up the IE interface.
Secure NTP is used to synchronize the CP 1543-1 in-
ternal system clock with an NTP server.
SNMPv3 permits the CP 1543-1 to read network man-
agement data (MIBs) from SNMPv3 agent with authen-
tication.
Function Manual, 05/2021, A5E03735815-AJ
Communication