Operation
6.8 Communication via PROFINET IO
Inverter chassis units
258 Operating Instructions, 07/2016, A5E00331449A
PROFINET IO with RT (Real Time)
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. RT communication is the basis for data
exchange with PROFINET IO.
PROFINET IO with IRT (Isochronous Real Time)
Isochronous real time: 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). IRT is also known as time-scheduled communication whereby knowledge
about the network structure (topology) is utilized. IRT requires special network components
that support planned data transfer.
SINAMICS cycle times of minimum 250 μs (on-board) / 500 μs (CBE20) and a jitter accuracy
of less than 1 μs can be achieved when this transmission method is implemented.
Figure 6-31 Bandwidth distribution/reservation, PROFINET IO
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 rating plate (CU320-2
PN), e.g.: 08-00-06-6B-80-C0.
The Control Unit CU320-2 PN has two onboard interfaces:
● One Ethernet interface
● A PROFINET interface with two ports
The two MAC addresses of the Ethernet and PROFINET interfaces are stamped on the
rating plate.
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