Siemens SINAMICS Configuration Manual page 142

Communication
A.1 Communication
The DHCP address assignment can be set from the SIMATIC Manager or using SINAMICS
parameters.
Setting the DHCP address assignment with SIMATIC Manager (STEP 7)
1. Call the "Target system > Edit Ethernet node" menu path in the SIMATIC Manager.
2. Click the "Search" button in the "Ethernet nodes" area.
3. Select the desired SINAMICS device.
You can now specify in the "Edit Ethernet nodes" configuration dialog that a dynamic IP
address will be generated via a DHCP server. The IP address can be identified in two ways:
– MAC address
– Device name (name of station)
The "MAC address" option has the disadvantage that the MAC addresses are no longer
correct after a device replacement.
4. Click the "Obtain the IP address from a DHCP server" option in the dialog to activate.
5. Activate either the "MAC address" or the "Device name" option in the "Identified via" area.
6. Click "Assign IP configuration".
The IP address is then taken from the DHCP server. The SINAMICS device uses the
associated setting after a POWER ON to obtain a new IP address from the DHCP server.
Setting the DHCP address assignment with SINAMICS parameters
As an alternative to the address assignment by the SIMATIC Manager, the DHCP address
assignment can also be initiated using SINAMICS parameters. In this case, the Control Unit
always fetches the IP address from a DHCP server after each POWER ON. You can make
the settings using the expert list of the STARTER:
1. Activate the DHCP address assignment using one of the following settings (where the
values 2 and 3 mean "MAC address" and "Device name", respectively):
– For Ethernet onboard (X127): p8904 = 2 or 3
– For PROFINET onboard: p8924 = 2 or 3
– For CBE20: p8944 = 2 or 3
The DHCP server now assigns temporarily an IP address.
2. You can now activate the defined interface configuration (each value 1) or activate and
store permanently (each value 2). Make one of the following settings:
– For Ethernet onboard (X127): p8905 = 1 or 2
– For CBE20: p8945 = 2
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A direct activation is not possible for the CBE20. The configuration can only be saved.
The setting then becomes automatically active for the next POWER ON.
Configuration Manual, 08/2017, A5E36912609A
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