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Types of PROFINET Communications
Genius Communications Gateways use two types of PROFINET communication transfers: real-
time and non-real-time. The illustration below shows real-time communications as solid lines
and non-real-time communications as dashed lines.
•
Real-Time (RT) communication: PROFINET real-time communication is used for time-sensitive
data. A PROFINET IO-Controller (PROFINET Controller) and PROFINET IO-Device use two types
of real-time communications to exchange data: cyclic communication and acyclic
communication:
•
Real-time Cyclic communication is used to periodically transfer the application's input
and output data. Cyclic communication occurs each PROFINET IO production cycle.
•
Real-time Acyclic communication is used to transfer non-periodic data such as alarms.
Acyclic communication occurs only when needed.
•
Non-Real-Time (NRT) communication: PROFINET non-real-time communication is used for
less time-sensitive data such as configuration, parameterization, diagnostics, and
identification data.
Operations of the Genius Communications Gateway
The Genius Communications Gateway performs the following operations:
•
Consumes PROFINET IO-Device configuration from the PROFINET IO-Controller over the
PROFINET network.
•
Scans input data from each Genius device it manages and produces that data to the
PROFINET IO-Controller.
•
Consumes the output data that it receives from the PROFINET IO-Controller and applies it
to each Genius device it manages.
•
Where needed, translates Genius Datagrams (background traffic) into PROFINET
packages that are sent to the PROFINET Controller. This includes Datagrams that
originated at the Genius Devices, such as Fault Reports.
•
Translates PROFINET packages that are sent by the PROFINET Controller into Genius
Datagrams. This includes Datagrams that originated at the PLC through use of COMMREQ
or Data_Init_Comm instructions. For example, a COMMREQ is used to generate a Clear
Fault Report datagram.
GFK-2892B
RX3i with PROFINET Controller (PNC)
1
OK
2
LAN
3
STAT US
4
CONN
PNS001
TO INSTALL,
TORQUE TO
6 IN -LB.
ACTIVE
USB
IP ADDRESS
MAC ADDRESS
PORTS
FRONT
3 4
1 2
IO DEVICE
Real-Time Data
Inputs
Outputs
Alarms
Figure 6: Real-Time & Non-Real-Time Data Types
PACSystems RX3i Genius Communications Gateway User Manual
Non Real-Time
Data
Parameters
Configuration Data
Chapter 1. Introduction
Public 13
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