Addresses - Siemens Sinamics S120 Function Manual

Communication
10.3 Communication via PROFINET IO
Process data and alarms are always transmitted in real time (RT) within the PROFINET IO
system. RT communication provides the basis for data exchange with PROFINET IO. Real-
time data are treated as a higher priority than TCP(UDP)/IP data. Transmission of time-
critical data takes place at guaranteed time intervals.
PROFINET IO with IRT (Isochronous Real Time)
Isochronous Real Time Ethernet: Real time property of PROFINET IO where IRT telegrams
are transmitted deterministically via planned communication paths in a defined sequence to
achieve the best possible synchronism and performance between the IO controller and IO
device (drive unit). This is also known as time-scheduled communication whereby
knowledge about the network structure is utilized. IRT requires special network components
that support planned data transfer.
Cycle times of minimum 500 μs and a jitter accuracy of less than 1 μs can be achieved when
this transmission method is implemented.
Figure 10-41 Bandwidth distribution/reservation, PROFINET IO
10.3.1.2

Addresses

MAC address
Every Ethernet and PROFINET interface is assigned a worldwide unique device identifier in
the factory. This 6-byte long device identifier is the MAC address. The MAC address is
divided up as follows:
● 3 bytes for the manufacturer's ID
● 3 bytes device identifier (consecutive number)
The MAC address is printed on a label (CBE20) or specified on the type plate (CU320-2 PN
and CU310-2 PN), e.g.: 08-00-06-6B-80-C0.
The Control Units CU320-2 PN and CU310-2 PN have two integrated interfaces:
● One Ethernet interface
● A PROFINET interface with two ports
The two MAC addresses of the Ethernet and PROFINET interfaces are stamped on the type
plate.
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Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions