Configuring the Ethernet CP with STEP 7
3.3 Setting further CP properties
Configuring and commissioning S7 CPs for Industrial Ethernet
56 Configuration Manual, 09/2013, C79000-G8976-C182-13
The selection you make also decides whether communication connections are set up by the
project engineering or via the interface in the user program (IP_CONFIG instruction).
The following options are available:
●
Set IP address in the project
This is the default setting for PLCs. You specify the IP address when the device is
networked. The IP address CP is therefore fixed.
With this option, you must configure communications connections.
●
Obtain an IP address from a DHCP server
If you select this option, the IP address is obtained from a DHCP server when the device
starts up.
The DHCP server is informed of the MAC address of the interface or the client ID that can
be entered in the configuration.
The client ID is a string with a maximum of 63 characters. Only the following characters
can be used:
– a-z, A-Z, 0-9, - (hyphen)
Requirements / restrictions:
If you select this option, it is initially not possible to create a fully specified connection in
the project because the local IP address is not known.
You therefore select "unspecified" with passive connection establishment as the
connection type.
●
Set IP address in the user program
With this option, you specify that the IP address is set over the user program interface
(function block IP_CONFIG). This allows the IP address to be supplied dynamically during
operation.
In this use case, communications connections are set up only via the interface of the user
program. Connection configuration is no longer possible (relates to connections via: TCP,
ISO-on-TCP, UDP, ISO transport ).
●
Set IP address using a different method
With this option, you specify that the IP address is set by other services outside the
configuration.
In this case, connection configuration is no longer possible (relates to connections via:
TCP, ISO-on-TCP, UDP, ISO transport ).
Note
Communications connections have already been configured
In the following situation, you receive the message that the configured connections no
longer work:
already configured communications connections via the interface configured
here and select a different setting from "Set IP address in the project".
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