Manual MVK-MP
72 V 3.5
Glossary
General Information about Profibus
Bus segment The electrical specification of the RS-485 interface limits the number
of devices in an RS485 network to 32. If more than 32 Profibus
devices have to be used, the network must be segmented by means
of repeaters.
DP Decentralized Peripherals. Profibus protocol for high-speed cyclic data
exchange.
Freeze-Mode The input data of the slave are "frozen".
GAP factor The number of bus cycles after which a DP master searches for new
active devices in order to include them into the token ring. This factor
can be modified in order to optimize the speed of a DP network.
GAP range The address range, in which an active device searches for other new
active devices. This range is always between the own address and
the address of the next active device that is already in the token ring.
The range from the highest address up to 127 does not belong to the
GAP range.
GSD The GSD file (electronic data sheet) describes the technical features
of a Profibus product. This file is required for the Profibus system
configuration and is provided by the device manufacturer.
ID number A 16-bit number which positively identifies a Profibus product. It is a
reference to the GSD file. More than one device can have the same
ID number, provided that the numbers can be written to a common
GDS file. This number is allocated by the "Profibus Nutzerorganisation
e.V." (Profibus Users Organization).
IEC 61158 Globally recognized standard for Profibus DP and FMS which
supersedes the international standard EN 50170 Volume 2.
Master Class 1 The master that performs user data transfer.
Master Class 2 Master for control, startup, and configuration tasks.
Byte Term from IEC 61158. Equals 1 byte or 8 bits.
PNO Profibus Nutzerorganisation e.V. (Profibus Users Organization).
Repeater Coupler element for signal processing between Profibus segments.
PLC Programmable Logic Controller
Sync-mode The output data of the slave are "frozen".
Token The active device (master) in possession of the token can carry out
data exchange with the slaves that were parameterized and
configured by this master. On completion of the data cycle, the active
device passes the token over to the next active device.
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