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Manual – DFE32B Fieldbus Interface PROFINET IO
6
Introduction
Operating Behavior in Conjunction with PROFINET
6 Operating Behavior in Conjunction with PROFINET
6.1 Introduction
Classic fieldbus communication is enhanced by fast Ethernet technology as a physical
transmission medium using PROFINET IO. Profinet supports real-time capable process
communication as well as open communication via Ethernet TCP/IP. PROFINET distin-
guishes between three communication classes that differentiate in terms of efficiency
and functionality.
Three communi-
cation classes
• TCP/IP
Open Ethernet TCP/IP communication without real-time requirements (e.g. Web
technology)
• RT (Real-Time)
IO data exchange between automation units in real-time (>1 ms).
• IRT (Isochronous Real-Time)
Isochronous real-time communication for synchronized IO data exchange (e.g. for
motion control applications - not for DFE32B option).
The DFE32B option meets the requirements of the PROFINET RT class and provides
open communication via TCP/IP or UDP/IP.
Three unit
classes
PROFINET IO differentiates between three unit types - "IO controller", "IO device" und
"IO supervisor."
• IO controller
The IO controller undertakes the master function for the cyclic IO data exchange with
the decentralized field units and is usually implemented as a communication inter-
face of a controller. It is similar to a PROFIBUS DP master class 1. A PROFINET IO
system can have several IO controllers.
• IO device
All field units of PROFINET IO that are controlled by an IO controller are designated
as IO devices, e.g. I/O, drives, valve terminals, etc. IO devices are comparable with
PROFIBUS DP slave nodes. The DFE32B option is a PROFINET IO device.
• IO supervisor
Programming devices/PC with corresponding engineering/diagnostic tools are des-
ignated as IO supervisors. IO supervisors have access to process and parameter
data as well as alarm and diagnostic information.
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