Programmed Communication Connections With Ip_Config; Ip Access Protection With Programmed Communications Connections - Siemens S7-400 Equipment Manual

Configuration and operation
6.9 Interface in the user program
6.9.2

Programmed communication connections with IP_CONFIG

Downloading the configuration using FB55
FB55 allows programcontrolled transfer of the configuration data.
Note
If the CP is in STOP mode and the configuration is downloaded using FB55, the CP then
changes automatically to RUN.
Special features / restriction
Simultaneous operation of configured and programmed connections is not possible. As soon
as an IP address is set via the FB55, all configured connections are removed.
Note
No use of IP_CONFIG (FB55) when operating the CP with fault-tolerant S7 connections.
If you configure fault-tolerant S7 connections via the CP, you cannot use program block
IP_CONFIG (FB55) for IP configuration of the CP.
You will find further information on special features and use in fault-tolerant systems in the
section on program-controlled IP configuration in /14/ (Page 106)/.
6.9.3

IP access protection with programmed communications connections

In principle, it is possible to set up communications connections using program block
IP_CONFIG (FB55) by programming and at the same time by configuring IP access protection.
When configuring specified connections (active endpoints) in STEP 7, the IP addresses of the
partners are entered automatically in the IPACL (IP Access Control List).
Communications connections programmed with FB55 are also entered in the ACL.
Please note the following point:
Note
The IP addresses of partners with unspecified connections (passive end points) are not
entered in the IPACL. Communication with unspecified nodes is only possible when IP access
protection is enabled if the IP addresses were entered previously in the ACL during
configuration.
The configuration of IP access protection and the aspects when security is enabled are
described in the general part of this manual /2/ (Page 103).
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Equipment Manual, 03/2023, C79000-G8976-C256-07
CP 443-1 Advanced