PROFINET IO OVERVIEW

AR

Application Relationship - The relationship between a PROFINET IO Controller and an I/O device. A PROFINET IO device can support more than one Application Relationship.

AP

Application Process - The application process running in the v device. PROFINET supports a default Application Processes and additional, profile specific application processes.

Channel

A single I/O point. A Channel can be discrete or analog.

Subslot

A group of one or more channels. Subslots can be real or virtual.

Slot

A group of one or more Subslots. Slots can be real or virtual.

Module

Modules are user defined components that plug into slots. Modules can be real or virtual.

Submodule

A component of a module that is plugged into a subslot. A submodule is real or virtual.

Cyclic Communications

Scheduled, repetitive communications. I/O data and alarm transfers are cyclic.

Acyclic Communications

Unscheduled, on demand communications. Diagnostic messages from an IO Supervisor to an I/O Device are Acyclic.

GSD

Generic Station Description

GSDML

Generic Station Description Markup Language - The file containing the XML description of the PROFINET IO device.

Provider Status

The Status an I/O device provides to an IO Controller with the data transferred to the Controller.

Consumer Status

The Status an I/O device provides to an IO Controller for the data it consumes from IO Controller.

RT

Real Time - The Real Time PROFINET IO Channel. I/O and Alarm Data are transferred over the RT Channel.

NRT

Non Real Time - The non Real Time PROFINET IO Channel. Configuration and diagnostic messages are transferred over the NRT Channel.

CR

Communication Relationship - A virtual communication channel within an AR

Frame ID

The two byte field in the Ethernet frame which defines the type of PROFINET IO message.

Proxy

A device which maps non PROFINET IO data to PROFInet.

DCP

Discovery Control Protocol - A communications protocol with PROFINET IO that allows an IO Controller or Supervisor to find every PROFINET IO device on a subnet.