Siemens WEBUI - Glossary

XI
SIG-QG-20-02 JANUARY 2021
Version: A.2
GLOSSARY
TERM
DESCRIPTION
AAR:
Association of American Railroads – An organization that establishes
uniformity and standardization among different railroad systems.
AREMA:
American Railroad Equipment Manufacturing Association – An organization
that supersedes AAR.
ATCS:
Advanced Train Control System – A set of standards compiled by the AAR
for controlling all aspects of train operation.
ECD:
External Configuration Device – A serial EEPROM (Flash Memory) device
mounted inside the chassis of the GEO unit. The ECD is used to store site-
specific configuration data (MCF, SIN, UCN, and card parameters) for the
CPU.
EX Value
Is the phase of the received signal, which is the measure of the impedance
of the track ballast. This measurement identifies how much current is leaking
from one rail to another.
EZ Value
Is the measure of the received signal level.
MEF:
Module Executable File – The executive software running in the CPU or I/O
Modules. The user can download the MEF through the Diag port to update
the software.
MCF:
Module Configuration File – The GCP application logic file.
SIN:
Site Identification Number – The 12-digit ATCS address for the The SIN has
the form 7.RRR.LLL.GGG.SS stored in binary coded decimal, with each digit
in one nibble. The digit 0 is represented by “A” and 0 is used as a null byte.
Site Location:
The location where GCP unit is installed.
VPI:
Vital Parallel Input – A module input circuit the function of which affects the
safety of train operation.
VRO:
Vital Relay Output – A module output circuit the function of which affects the
safety of train operation.