Addresses - Siemens SINAMICS S120 Function Manual

Communication
10.3 Communication via PROFINET IO
PROFINET IO with RT (Real Time)
Real time means that a system processes external events over a defined period.
Process data and alarms are always transferred in real time (RT) within the PROFINET IO
system. RT communication provides the basis for data exchange with PROFINET IO. Real-
time data is treated with 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 transferred 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.
Minimum cycle times of 500 μs and a jitter accuracy of less than 1 μs can be achieved with
this transmission method.
Figure 10-42 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:
● Three bytes for the manufacturer's ID
● Three bytes for the 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 on the type plate.
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Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions