List of Abbreviations/Glossary S5-95U, SINEC L2
C-4
EWA 4NEB 812 6112-02
Field device A device, such as a sensor or actuator, permitting the exchange of
information between the control system and the process
Field level A hierarchical level in an integrated automation system; the
interchange of information between the control system and the
process is implemented by means of field devices, sensors and
actuators
FMA services Debugging and diagnostic services for monitoring the network and
the local stations; implement network management functions to the
PROFIBUS standard
FO transmission
technology
Configuration of the SINEC L2 LAN using optical fiber conductors
or waveguides (necessary in noisy environments)
G
GAP Address area of the active station extending from its own address
to that of the next active station
I
Implicit communications Data communications over the LAN take place automatically and
are not initiated by the user program
Indication Indication of an event
L
LAN access method Controls access to the transmission medium by the stations to
guarantee the functional interchange of data
master-slave method
token passing method
Layer 2 Layer 2 of the ISO (International Organization for Standardization)
7-layer reference model for communications; in PROFIBUS terms,
layer 2 is referred to as the Fieldbus Data Link (FDL)
Layer 2 services Communications mechanisms provided to the user by the layer 2
firmware of the communications processor
Local station Initiator of a communications link, either as a sending or requesting
station
Longest station delay time The longest time elapsing between sending or receiving the last bit
of a frame and the sending or receiving of the first bit of the next
frame
M
Master-slave method LAN access method when there is only one station active and all
other stations are passive; only the active station automatically has
the right to send, while all passive stations can send data to an
active station only when requested to do so by that station
Multicasting Transmitting from an active station to a group of active and passive
stations
O
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