Siemens SINAMICS DCM Manual page 468

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 10-43 Bandwidth distribution/reservation, PROFINET IO
10.5.2.2 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 on a label (CBE20), e.g. 08-00-06-6B-80-C0
IP address
The TCP/IP protocol is a prerequisite for establishing a connection and parameterization. To
allow a PROFINET device to be addressed as a node on Industrial Ethernet, this device
requires a unique IP address in the network. The IP address is made up of four decimal
numbers with a range of values from 0 through 255. The decimal numbers are separated by
a period. The IP address comprises:
● The address of the node (also called host or network node)
● The address of the (sub) network
SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
ac.maher.co.ir
Descriptions of functions
10.5 Communication via PROFINET IO
469