Glossary
SICAM RTUs, SICAM MIC System Description
83
MC6-054-2.00, Edition 07.2014
C
CAEx plus
Tool for the creation of application programs (Computer Aided Engineering), based on the tool logiCAD ®
from the company logi.cals ®
CASDU
Common Adress of the
ASDU, that part of the ASDU, that is common for all ASDUs of a station
Cause of transmission
Spontaneous transmission, general interrogation data, periodical data, command preparation, command
command activation (acc. to IEC 60870-5-101)
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
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:
Class 1 data
Class 2 data
Dataflow routing
Functions and methods for distribution of messages to ist targets:
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