Kollmorgen AKD PROFINET RT Communication, Руководство пользователя

Страница: 26 / 53

AKD PROFINET | 5 PROFINET IO
5.1 Introduction
PROFINET IO is a real time protocol based on Ethernet. It is used as high level network for
industrial automation applications. PROFINET IO is very similar to PROFIbus and focuses
on the data exchange for programmable controller.
A PROFINET IO network consists of following devices:
l
IO controller: This is typically the PLC, which controls the whole application.
l
IO device: a decentralized IO device (e.g. drive, encoder, sensor), which is controlled by
the IO controller.
l
IO supervisor: HMI (human machine interface) or PC for diagnostic purposes or com-
missioning.
The real time channel (RT) is used for IO data and alarm mechanism. In PROFINET IO RT
(conformance class A and B), the RT data is transferred via a prioritized Ethernet frame. No
special hardware is required. Due to this prioritization a cycle time < 10ms can be achieved.
l
PROFINET IO IRT is used for higher timing requirements. Cycle times < 1ms is possible,
but also special hardware for IO Devices and switches are required.
All diagnostic and configuration data is transferred via the non real time channel (NRT). The
well known UDP protocol is used for this purpose. Anyhow, no timing determinism can be
guaranteed and typical the cycle times can be > 100ms.
5.2 Restrictions and requirements
5.2.1 Conformance Classes
AKD support Conformance Classes A and B. This means PROFIdrive parameters can be
configured over the PROFINET network, fault can be delivered and cyclic data channel func-
tions. However, the synchronization between axes can not take place since it is a part of
Conformance Class C.
5.2.2 Cycle time of RT data
AKD fastest cycle time for the PROFINET cyclic data is 8 milliseconds.
5.2.3 Connector
PROFINET network connector in the AKD is the same RJ45 connector used for the service
functions. This connector is numbered as X11 on the AKD’s top panel.
5.2.4 Network topology
AKD can be connected as an I/O device on the PROFINET network in two manners:
1. As the last node in the network (since AKD has only one connector) in a line topology
2. As another node on the network in star topology (using a switch)
26 Kollmorgen | December 2014