Profinet Acyclic Communication; Features Of An Io Controller System; Features Of An Io-Supervisor System - GE AF-650 GP PROFINET Operating Instructions Manual

PROFINET Acyclic Communicat... PROFINET Operating Instruction

7 PROFINET Acyclic Communication

PROFINET offers additional to the cyclical data communi-
cation, an cyclical communication. This feature is possible by
an IO controller (e.g. PLC), as well as an IO Supervisor (e.g. PC
Tool).
Cyclical communication means that data transfer takes place
all the time with a certain update rate. This is the known
function normally used for quick update of I/O Process Data.
A-cyclical communication means a one time event, mainly
used for Read/Write on parameters from Process controllers,
PC based tools or monitoring systems.

7.1.1 Features of an IO Controller System

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- Cyclical data exchange.
- A-cyclical read/write on parameters.
The a-cyclical connection is fixed and can not be changed
during operation.
In general an IO controller is used as Process controller,
responsible for commands, speed reference, status of the
application etc. ( PLC or PC based controller.)
The IO controller, a-cyclical connection might be used for
general parameter access in the slaves.

7.1.2 Features of an IO-Supervisor System

- Initiate/Abort a-cyclical connection.
- A-cyclical read/write on parameters.
The a-cyclical connection can be established dynamically
(Initiate) or removed (Abort) even though an IO controller is
active on the network.
The a-cyclical connection is typically used for configuration
or commissioning tools for easy access to each parameter in
any slave in the system.
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