NORD Drivesystems BU0590 - Manual (Page 6)

PROFINET bus module for NORD frequency inverters SK 5xxE
6 Subject to technical amendments BU 0590 GB-0312
1 Introduction
1.1 General information
Modern field bus systems, microcontrollers and communication networks have had a great influence on
automation systems and have resulted in greater flexibility, availability and ultimately, also a reduction in
costs.
The widespread use of PC-based control only became possible with the availability of field bus systems.
With increasing control unit performance, the classic field bus ultimately became the limiting criterion for the
entire system. It was therefore an obvious step to adapt Ethernet technology, which provides high rates of
data transmission in IT applications, to the field of automation.
1.2 The bus system
As a physical transfer medium, PROFINET® transfers many years of experience with PROFIBUS-DP-V1 to
Fast Ethernet. In addition to the conventional open Ethernet communication TCP/IP it enables real time
communication of process data. PROFINET defines three communication classes, which provide different
levels of efficiency and functionality:
 TCP/IP or UDP/IP communication without real time capability
 Real time communication for process data (>1ms) RT
 Isochronous real time communication for synchronised process data  IRT
Features of the SK TU3-PNT
 PROFINET IO real time communication (RT=Real Time and IRT=Isochronous Real Time)
 Automatic address assignment via the IO controller using DCP (discovery configuration protocol)
 Switched
Ethernet
 Autonegotiation (negotiation of transfer parameters)
 Autocrossover (Transmission and reception cables crossed over in the switch)
 Conforms with Class B, C
Performance
 100Mbit/s data communication
 Full duplex transmission
 Transmission of a maximum of five setpoints or actual values possible