Siemens SIMATIC ET 200AL, System Manual

Page: 1126 / 2255

Preface
Communication
Function Manual, 05/2021, A5E03735815-AJ
5
What's new? What are the customer benefits? Where can I find the information?
Dynamic assignment of the net-
work configuration with DHCP
Deployment of the CPU in IT managed networks
using the following functions:
•
Connection of the CPU to an existing network
without additional manual configuration of
the network interface
• Request for network parameters for the CPU
according to RFC 2131 from a DHCPv4 server
(IP address and subnet mask, default IP router
address and further optional network parame-
ters such as DNS and NTP server addresses)
Addressing via DHCP (Page 359)
Name-based addressing with
DNS
• DNS server addresses can be obtained from
the CPU via DHCP
• The CPU can obtain host and domain names
from a DHCP server for applications that are
implemented with OPC UA or (Secure) OUC.
• The CPU may transfer configured host or
domain names to DHCP servers coupled with
DNS servers for dynamic matching (Dynamic
DNS).
• The NTP client of the CPU can address NTP
servers with names
• Network parameters can be written with the
new "CommConfig" instruction, for example,
IP address parameters, DNS server, host and
domain name
DHCP with DNS (Page 363)