Siemens SIMATIC NET PROFIBUS Wartungshandbuch Seite 231

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Glossary
DP Base Programming Interface for CP 5613/CP 5614
C79000-G8976-C108-01
231
FREEZE mode
The FREEZE mode is a DP mode in which the process data are acquired at the
same time from all (or a group) of DP slaves. The time at which the data are
required is indicated in the FREEZE command (a synchronization control frame).
Gap update factor
A free address area between two active nodes is checked cyclically by the node
with the lower PROFIBUS address to find out whether or not another station is
requesting to enter the logical ring. The cycle time for this check is as follows:
gap update factor x target rotation time [ms]
Group identifier
DP slaves can be assigned to one or more groups using a group identifier. The DP
slaves can then be addressed by the group identifier when transferring control
frames.
Highest PROFIBUS address
A bus parameter for PROFIBUS. This specifies the highest PROFIBUS address of
an active node on the PROFIBUS. For passive nodes, PROFIBUS addresses
higher than the HSA are permitted (possible values: HSA 1 to 126).
HSA
H
ighest
S
tation
A
ddress - one of the bus parameters. Specifies the highest node
address used in the network.
Hardware event
Event whose arrival is monitored by the hardware of the CP (at the start of the
cycle, when data changes, when diagnostic data arrive, and when a fast logic
condition arrives).
Input data
Here: the data read cyclically by the DP master from the slaves.
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