Chapter 1. Introduction
28 PACSystems* RX3i & RSTi-EP PROFINET IO-Controller User Manual GFK-2571N
1.7 Glossary
Application Relationship. PROFINET term for a relationship that is established between an
IO-Controller/Supervisor and IO-Device. For any data to be exchanged between an IO-
Controller/Supervisor and a given IO-Device, an Application Relationship must be established.
Within the Application Relationship, various Communication Relationships (CRs) are then
established for the different types of data to be exchanged.
In Ethernet, the transmission of a network message to all hosts on the network.
In a PACSystems RX3i PROFINET network, a CPU Node is a node in which a PACSystems RX3i CPU
is connected to the PROFINET network.
Communication Relationship. PROFINET term for a channel that is established within an
Application Relationship (AR) to transfer specific data between an IO-Controller/Supervisor and a
given IO-Device. Multiple CRs are established within an AR to transfer data.
An Ethernet port connection on the PROFINET I/O Controller that is configured as a critical port.
When the last Critical Network Port is disconnected from its network, a diagnostic fault is logged.
In a redundancy system where the PROFINET I/O Controller is controlling redundant devices, this
results in a CPU redundancy role-switch with the CPU placed into Stop/Fault mode.
Device Access Point. This access point is used to address an IO-Device as an entity.
An Address Resolution Protocol (ARP) request sent by the host to resolve its own IP Address.
General Station Description Markup Language - definition of PROFINET Device Characteristics.
Input Output Communication Relationship – describes the type (input/output) and amount of I/O
data to be transferred, the sequence of the transfers and the transfer cycle between a PROFINET
IO-Controller (or IO-Supervisor) and a PROFINET IO-Device.
PROFINET Input/Output Consumer Status is transmitted on the PROFINET network to provide
feedback on Input Data for an IO controller and Output Data for an IO device.
PROFINET Input/Output Provider Status is transmitted on the PROFINET network to provide
feedback on Output Data for an IO controller and the Input Data for an IO device.
PROFINET abbreviation for the IOCS and/or IOPS (see above).
Link Layer Discovery Protocol. IEEE standardized protocol used by network devices to advertise
their identity and capabilities.
Link Layer Discovery Protocol Data Unit.
Media Access Control address (MAC address)
Management Information Basis
Media Redundancy Client. Within Media Redundancy Protocol, an MRC is responsible for helping
the MRM detect breaks/no breaks in the ring.
Media Redundancy Manager. Within Media Redundancy Protocol, an MRM is responsible for
ensuring that the ring does not have a closed loop, while simultaneously ensuring maximal
connectivity between nodes on the ring.
Media Redundancy Protocol. An Ethernet protocol that provides redundant paths for PROFINET-IO
cyclic traffic by supporting a ring topology.
In Ethernet, the transmission of a network message to all hosts within a host group.
If the IOCR Update Period is greater than the Send Clock time, the Update Period is divided into
multiple phases where each phase is equal to one Send Clock.
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