Siemens SINAMICS DCM Operating Instructions Manual page 346

Descriptions of functions
10.3 PROFINET IO
Device name
In its delivery state, an IO device does not have a device name. An IO device can only be
addressed by an IO controller (in order to transmit project engineering data (including the IP
address) during startup or exchange user data during cyclic operation, for example) after it
has been assigned a device name with the IO supervisor.
NOTICE
The unit name must be saved in a non-volatile fashion using HW Config from STEP 7.
Replacing the Control Unit (CUD) (IO device)
The IP address and device name are stored in the non-volatile memory in the form of
parameters (p61000 und p61001).
If a module is replaced, therefore, it is possible to continue running it as a PROFINET device
by resetting the parameters.
Definition: Subnet screen
The bits set in the subnet screen define the part of the IP address that contains the address
of the (sub)network. The following generally applies:
● The network address is obtained by an AND logic operation on the IP address and
● The node address is obtained by an AND NOT logic operation on the IP address and
Subnet screen example
Subnet screen: 255.255.0.0 (decimal) = 11111111.11111111.00000000.00000000 (binary),
IP address: 140.80.0.2, significance: The first 2 bytes of the IP address determine the
subnetwork; i.e. 140.80. The last two bytes address the node; i.e. 0.2.
Default router
If data needs to be forwarded via TCP/IP to a partner located outside the subnetwork, this is
carried out via the default router. In the Properties dialog in STEP 7 (Properties of Ethernet
interface > Parameters > Network transfer), the default router is referred to as the router.
STEP 7 assigns the local IP address to the default router.
346
subnet screen.
subnet screen.
SINAMICS DCM Control Module
Operating Instructions, 06.2010, C98130-A7067-A1-02-7619