Siemens Simatic ET 200S Operating Instructions Manual page 320

Glossary
Frequency converter
The frequency converter implements infinite control of the speed of asynchronous motors. It
controls both simple drive tasks (frequency control) and more sophisticated ones (vector
control). It can also be used to control torque.
Ground
The conductive mass of earth, the electrical potential of which can be set equivalent to zero
at all points. In the vicinity of grounding electrodes, the potential may not be zero. The term
"reference ground" is often used in this case.
The ground refers to all the interconnected inactive parts of a piece of equipment that, even
in the event of a fault, cannot pick up voltage that is dangerous to the touch.
Grounding
Grounding means connecting an electrically conductive part to a grounding electrode by
means of a grounding system.
GSD file
The properties of a PROFINET device are described in a GSD file (General Station
Descriptor), which contains all the information required for configuration.
Just as with PROFIBUS you can integrate a PROFINET device via a GSD file in STEP 7.
In PROFINET IO, the GSD file is always in XML format. The structure of the GSD file
corresponds to ISO 15734, the worldwide standard for device descriptions.
In the case of PROFIBUS the GSD file is available in the ASCII format (in compliance with
the IEC 61784-1:2002 Ed1 CP 3/1 standard).
Hot swapping
This is the removal and insertion of modules while the ET 200S is in operation.
Identification Data
Identification data are data that are stored in a module for assisting the user in:
• Checking the system configuration
• Locating hardware modifications in a system
• Correcting errors in a system
Identification data enable modules to be uniquely identified online.
IO modules
IO modules include all modules of an ET 200S inserted after the interface module. These
include power modules, electronic modules, technological modules, motor starters,
frequency converters.
Glossary-4
Operating Instructions, 12/2005, A5E00515771-03
ET 200S