V 1.6 37
Glossary
General Information About Profibus
Bus segment The electrical specification of the RS-485 interface limits the number of
users on an RS485 network to 32. If there are more than 32 Profibus
users, divide the network into segments using repeaters.
DP Decentral Periphery, Profibus protocol for rapid cyclical data exchange.
Freeze mode The Input data of the slave are "frozen".
GAP factor The number of bus passes after which a DP Master searches for
additional active users to include them in the token ring. This factor can
be modified to optimize the speed of a DP network.
GAP area The address area in which an active user searches for additional active
users. This area is always between the own address and the address of
the next active user already in the Token Ring. The area from the highest
address up to 127 does not belong to the GAP area.
GSD The devices master file describes the technical features of a Profibus
product. This file is required to configure a Profibus system, and is
provided by the device's manufacturer.
ID number A 16-bit number which clearly identifies a Profibus product. It is a
reference to the GSD file. Other devices may have the same ID number,
provided they can be configured in a common GSD file. This number is
allocated by Profibus Nutzerorganisation e.V..
IEC 61158 Globally recognized standard for Profibus DP and FMS Successor of the
international standard EN 50170, Volume 2.
Byte Term defined by IEC 61158. 1 byte corresponds to 8 bits.
PNO Profibus Nutzerorganisation e.V (German Profibus user organization).
Repeater Coupling element for signal conditioning between Profibus segments.
SPC Stored Program Controller
Sync Mode The output data of the Slave are "frozen".
Token The active user (master) in possession of the token can carry out data
exchange with the slaves which it has parameterized and configured. On
completion of the data cycle, the active user passes the token on to the
next active user.
www.comoso.com
To Next Page
Loading...
Need help?
General
