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Operation
6.9 Communication via PROFINET IO
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 in which IRT frames are
transmitted deterministically and 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 scheduled communication in which knowledge
about the network structure (topology) is utilized. IRT requires special network components
that support scheduled data transmission.
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 6-40
6.9.2.3
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 consists
of:
● 3-byte manufacturer identification
● 3-byte device identification (consecutive number)
The MAC address is printed on a label (CBE20) or specified on the type 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 type
plate.
360
Bandwidth distribution/reservation, PROFINET IO
Converter cabinet units
Operating Instructions, 11/2017, A5E36652151A
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