Glossary
SICAM RTUs, User Manual SICAM CMIC 407
DC8-001-2.09, Edition 08.2016
Class 1 data
If several data points are to be transmitted to the central station (spontaneous or on request) at the same
time, the Class 1 data will be sent before the Class 2 data (priority).
With dial-up traffic, data of the Class 1 lead to a spontaneous connection setup and data transmission.
Class 2 data
If several data points are to be transmitted to the central station (spontaneous or on request) at the same
time, the Class 2 data will be sent after the Class 1 data.
With dial-up traffic, the connection setup and the data transmission takes place only upon interrogation by
the central station.
Command direction
Transmission facility from the central station to a substation
Command return information
The command return information is an additional information for the double-point information, displays the
reason for the status change (breaker tripping or switching operation in progress)
Configuration
Configuration is used in a multiple meaning:
a) engineering of the configuration of an automation unit in the engineering tool
b) physical aligning and mounting of the configured hardware
– plugging in the slot defined by the configuration (slot addressing), or
– setting the address defined by the configuration, and plugging in an arbitrary slot (adjustable address)
COT
ž Cause of Transmission
CPU
Central Processing Unit
CTS
Clear to Send, handshake control line of an RS-232 interface
Cyclic transmission
Periodical transmission according to the scan rate of the application program
D
Data class
This assignment is specified in the standard IEC 60870-5-101/-104, and serves for the priorization of in-
formation objects for the transmission by the communication function:
ž Class 1 data
ž Class 2 data
Dataflow routing
Functions and methods for distribution of messages to ist targets:
ž Automatic data flow routing
ž Selective data flow routing
Datapoint
Analog or binary information (process data point, System data point)
Data stream
Transports a sequence of data-point related information through the telecontrol system from a source to
one or more sinks.
There are spontaneous and periodical data streams. (spontaeous data strems transport information in tel-
egrams)
Datentransporter and system message router
System-internal distribution point for application data and system data messages from and to the single
systemfunctions resp. application; application data is distributed by means of routing, system data by
means of target addressing to the data sinks
DCD
Data Carrier Detect; control line of a RS-232 interface for the evaluation of the receive signal level
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