TR-Electronic 65 Serie Montageanleitung Seite 123

3.1.1 PROFINET IO
As in the case of PROFIBUS-DP, also at PROFINET IO the measuring system is
managed as a decentralized field device. The device model corresponds to the basic
characteristics of PROFIBUS and is consisting of places of insertion (slots) and
groups of I/O channels (subslots) and an index. Thus the measuring system
corresponds to a modular device. In contrast to a compact device the capabilities can
be specified during configuration.
The technical characteristics of the measuring system are described by the so-called
GSD file (General Station Description), based on XML.
As usual, the measuring system is assigned to one control unit at the project
engineering.
Because all Ethernet subscribers operate equally at the net, in case of PROFINET IO
the well-known Master/Slave technique is implemented as Provider/Consumer model.
The Provider (measuring system) corresponds to the sender, which transmits its data
without request to the communication partners, the Consumer (PLC), which processes
the data.
In a PROFINET IO - system the following device classes are differentiated:
●
IO-Controller
For example a PLC, which controls the connected IO-Device.
●
IO-Device
Decentralized arranged field device (measuring system), which is assigned to one
or several IO-Controllers and transmits, additionally to the process and
configuration data, also alarms.
●
IO-Supervisor (Engineering System)
A programming device or an Industrial PC, which has also access to all process-
and parameter data additionally to an IO-Controller.
Application relations are existing between the components which contain several
communication relations for the transmission of configuration data (Standard-
Channel), process data (Real-Time-Channel) as well as alarms (Real-Time-Channel).
Printed in the Federal Republic of Germany
04/25/2022 TR-ECE-BA-DGB-0063 v15
 TR-Electronic GmbH 2007, All Rights Reserved
Page 79 of 131