Siemens SIPROTEC 5 Manual page 476

Glossary
Continuous Recorder
The continuous recorder is not a triggered recorder, runs constantly and has large averaging times. The
continuous recorder saves the arithmetic average value of the process quantities (power, frequency, RMS
values of the fundamental component of currents, voltages and symmetric components).
The continuous recorder is organized as a ring buffer. When the memory is filled completely, the oldest data
are overwritten automatically.
CRC
Cyclic redundancy check
Data type
The data type is a value set of a data object, together with the operations allowed on this value set. A data
type contains a classification of a data element, such as the determination whether it consists of integers,
letters, or similar.
Data unit
Information item with a joint transmission source. Abbreviation: DU = Data Unit
Data window
The right area of the project window visualizes the content of the area selected in the navigation window. The
data window contains for example, indications or measured values of the information lists or the function
selection for parameterization of the device.
DB
See Double Command.
DC
Double Command – See Double Command.
DCF77
The precise official time is determined in Germany by the Physikalisch-Technische Bundesanstalt PTB in Bruns-
wick. The atomic clock unit of the PTB transmits this time via the long-wave time signal transmitter in Main-
flingen near Frankfurt/Main. The emitted time signal can be received within a radius of approx. 1500 km from
Frankfurt/Main.
DCP
See Discovery and Basic Configuration Protocol
DEL
Phase-to-phase related measurements of a 3-phase system
DIGSI
Configuration software for SIPROTEC
Discovery and Basic Configuration Protocol
The DCP protocol is used to detect devices without IP addresses and to assign addresses to these devices.
DM
See Double-point indication
476 SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017