Open User Communication With Addressing Via Domain Names - Siemens SIMATIC ET 200AL System Manual

Additional information
The STEP 7 online help describes:
• The user and system data types
• The instructions for open communication
• The connection parameters
You will find information about the allocation and release of connection resources in the
section Allocation of connection resources (Page 395).
See also
Secure Open User Communication (Page 73)
6.4

Open User Communication with addressing via domain names

As of firmware version V2.0, S7-1500 CPUs, ET 200SP CPUs and the CPUs 1513/1516pro-2 PN
support Open User Communication with addressing via Domain Name System (DNS). A DNS
client is integrated in the CPU. In the case of communication via DNS, you use domain names
as an alias for IP addresses to address communication partners. Addressing of the
communication partners via domain names is possible for open communication via TCP and
UDP.
At least one DNS server must be located in your network as a requirement for communication
via DNS.
The S7-1500 software controller supports communication via DNS for all interfaces that are
assigned to the software controller.
Communication
Function Manual, 05/2021, A5E03735815-AJ
6.4 Open User Communication with addressing via domain names
Open User Communication
119