Glossary Of Profinet Terms - Datalogic AMT58 Series Manual

GLOSSARY OF PROFINET TERMS

PROFINET IO, like many other networking systems, has a set of unique terminology. The
table below contains a few of the technical terms used in this guide to describe the
PROFINET IO interface. Sometimes they also refer more specifically to the S7 program-
ming environment. They are listed in alphabetical order.
Acyclic Communications
AP
API
Application class
AR
Automation system
Bus
Channel
Consumer Status
CPU
CR
Cyclic Communications
Data block
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Unscheduled, on demand communications. Diagnostic messages
from an IO Supervisor to an IO Device are Acyclic.
Application Process - The application process running in the
device. PROFINET supports a default Application Processes and
additional profile specific application processes.
The value of the API (Application Process Identifier) parameter
specifies the application that is processing the IO data. PROFINET
standard IEC 61158 assigns profiles to certain APIs (PROFIdrive,
PROFIslave) which are defined by the PROFINET User Organiza-
tion. The standard API is 0.
An application class specifies a number of mandatory functions
and addition optional functions to be supported by an IO device.
The Profinet encoders can be configured as CLASS 3 and CLASS 4
PROFINET IO devices according to the encoder profile.
Application Relation - The relationship between a PROFINET IO
Controller and an IO device. A PROFINET IO device can support
more than one Application Relationship.
Programmable logic controller for the open-loop and closed-loop
control of process chains in process and production engineering.
The automation system consists of different components and inte-
grated system functions depending on the automation task.
A bus is a communication medium connecting several nodes. Data
can be transferred via serial or parallel circuits, that is, via electri-
cal conductors or fiber optic.
A single IO point. A Channel can be discrete or analog.
The Status an IO device provides to an IO Controller for the data it
consumes from IO Controller.
Central Processing Unit - Central module of an automation system
with a control and arithmetic unit, memory, operating system and
interface for programming device.
Communication Relationship - A virtual communication channel
within an AR.
Scheduled, repetitive communications. IO data and alarm trans-
fers are cyclic.
In contrast to code blocks, data blocks (DB) do not contain Step 7
statements. They are used to save data, i.e. variable data which
are processed by the user program. Global data blocks serve to
accommodate user data which can be used by all other blocks.