Proceedings 2002/2003 - IRSE

76
CTRL SIGNALLING AND COMMUNICATIONS
Adjacent ITCS
Points control
and monitoring
Other signalling
trackside equipment
ITCS
Inputs/Outputs Rack
Route Control
Centre
Processing
unit
Track Interface Rack
Central
Maintenance
Equipment
Local
Maintenance
Equipment
Track Circuit
Intermittent
Transmission
Loop
Track
mentary functions shown within signalling principles
diagrams in GRAPHCET format. These functions are
mainly used for management of routes and to
control and lock points. Translated into computer
language, they form a library of basic functions from
which the data for a site is built. As it is designed,
this architecture allows the modification of one or
several functions without the need to alter the
generic layer already validated. This property is used
when signalling principles specific to a network have
to be implemented.
Data Layer
This layer is completely independent from the two
others. It allows the equipment to be configured for
a specific site (consistency, track layout, functional
specification…). This site-specific information is
given in the scheme plan, control tables and data
preparation documents.
ASSOCIATED TOOLS
The level of safety needed by this computerised
signalling system requires data preparation and
testing tools to manage the design process and to
achieve the necessary quality level.
DATA PREPARATION TOOL
The data preparation tool is divided into two main
functions:
• data preparation tool for signalling principles;
• data preparation tool for site information.
DATA PREPARATION TOOL FOR SIGNALLING
PRINCIPLES
The objective of this tool is to enter the signalling
principles diagrams in order to create a set of
system parameters, usable for a whole line, within
the Application Specific Layer. This tool uses the
Signalling Principles Diagrams (GRAPHCET format),
independently checked, as input data to create the
Signalling Principles database. In addition, a printed
file allows the checking of the principles entered in
the system: System Parameters Verification Files
(SVF). When the checking is done, the final version
can be issued as well: System Parameters Files (SF).
As configuration management is incorporated in
the tool, differences between two versions can be
highlighted: DeltaSVF or DeltaSF. When issued for
checking or for application, the current version of
principles is “locked”. If a modification is required, a
new configuration with a new version identifier must
be created.
Not OK
Signalling Principles
Diagrams
Signalling Principles
Data Capture
Issue of SVF and
DeltaSVF
(Configuring and
locking)
Checking
OK
Issue of SVF and
DeltaSVF
(Configuring and
locking)
DATA PREPARATION TOOL FOR SITE
INFORMATION
The objective of this tool is to enter specific site
data in order to create a set of site parameters,
usable for one ITCS cubicle, within the Data Layer.
This tool uses technical documents such as scheme
plans, control tables, independently checked, as
input data to create the site parameters database. A
locked version of the Principles must be used.
In addition, a printed file allows checking of the
parameters entered in the system: Parameters
Verification Files (PVF). When the checking is done,
the final version can be issued as well: Parameters
Configuration Files (COF). As configuration management
is incorporated in the tool, differences between