Configuration and operation
6.9 Interface in the user program
CP 443-1 (EX30)
56 Manual, 03/2019, C79000-G8976-C255-05
Special features / restriction
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 /11/ (Page 84).
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 IP
ACL. 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.
How to configure IP access protection is described in the general part of this manual /2/
(Page 82).
Programmed communications connections - assigning parameters to the ports
The CP now supports the following settings when assigning parameters to the ports in the
parameter block for TCP connections and UDP connections:
● SUB_LOC_PORT parameter
The port can be specified as an option when the connection is established actively.
● SUB_REM_PORT parameter
The port can be specified as an option when the connection is established passively.
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