Definitions and abbreviations
107
Definitions and abbreviations
PROFINET IO definitions
Acyclic
Communication
Communication in which messages are sent only once
on request
Array
Parameter consisting of data fields of equal data type
Broadcast
Non-acknowledged message from master to all bus
participants (compare Multicast)
Command Word
See Control Word
Communication
Object
Any object of a real device that can be communicated
with (variable, program, data range, etc.). Stored locally
in the Object Dictionary.
Control Word
16-bit word from master to slave with bit-coded control
signals (sometimes called the Command Word).
Cyclic
Communication
Communication in which Parameter-/Process Data-
Objects are sent cyclically at predefined intervals
Device Class
Classification according to the number of profile
functions included in the device
Fault
Event that leads to tripping of the device
GSD File
ASCII-format device description file in a specified form.
Each device (active & passive stations) on PROFIBUS
has to have its own GSD File. GSD files in PROFINET
IO are written with GSDML.
Index
Access reference for Objects in PROFIBUS
IO-controller
Control system with bus initiative. In PROFINET IO
terminology, IO-controllers are also called master
stations.
Multicast
Non-acknowledged message from master to one group
of bus participants (compare Broadcast)
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