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Glossary
ET 200M
256
Operating Instructions, 12/2008, EWA-4NEB780600602-08
Fiber-optic cable
Fiber-optic cables are made from fibere-optics or plastic and have an extremely high
transmission rate. They are resistant to electromagnetic interference and practically tap-
proof.
FREEZE
is a control command that is issued by the DP master to a set of DP slaves.
Upon receiving the FREEZE control command the DP slave freezes the inputs at their
current states and transfers them to the DP master in cycles.
After each received FREEZE the DP slave freezes the input state again.
The DP slave will cyclically transfer the input data to the DP master only after the DP master
has issued the UNFREEZE control command.
Functional grounding
This grounding method is used to ensure that the electrical product is functioning as
expected. Functional grounding short-circuits any noise voltage that might render a product
impermissible.
Ground
Conductive ground has an electrical potential of zero.
Close to ground electrodes the ground's potential might be different from zero. The term
"reference ground" is frequently used to describe this situation.
Ground-free
No galvanic connection to → ground
Grounding
Grounding involves connecting an electrically conductive part with the ground electrode
through a grounding system.
GSD file
The properties of a PROFINET device are described in a GSD file (Generic Station
Description), which contains all required information for the configuration.
You can integrate PROFINET devices in STEP 7 using a GSD file similar to PROFIBUS
devices.
In the case of the PROFINET IO the GSD file is in XML format. The structure corresponds to
ISO 15734, the worldwide standard for device specifications.
For PROFIBUS, the GSD file is in ASCII format (according to IEC 61784-1:2002 Ed1 CP
3/1).
Summary of Contents for IM 153-4 PN
Page 186: ...Functions 8 9 SNMP ET 200M 184 Operating Instructions 12 2008 EWA 4NEB780600602 08 ...
Page 254: ...Order Numbers for the ET 200M ET 200M 252 Operating Instructions 12 2008 EWA 4NEB780600602 08 ...
Page 268: ...Glossary ET 200M 266 Operating Instructions 12 2008 EWA 4NEB780600602 08 ...