Specifications

Engineering Standard –NSW
Signalling SMS 02
Cerberus Level Crossing Monitor Equipment
March 2005 Version 1.2 © Australian Rail Track Corporation Page 9 of 118
This document is uncontrolled when printed.
1. Introduction
1.1 Referenced and Associated publications
The following Signal Engineering Specifications provide additional
information to this document.
Specification 1033 Vital Indication Optoisolator.
Specification 1068 Analogue to Digital Converter
Specification 1069 Current sensor.
Specification 1070 Level Crossing Monitor Requirements
Specification 1071 Level crossing monitor hardware
Specification 1072 Level Crossing monitor - backplane.
Specification 1073 Scada 2000 D12 - Individual Input
Optoisolator
Specification 1074 8 way output optoisolator
The following Signal Engineering manuals provide additional
information to this document.
Cerberus Control Centre users guide
SCADA 2000 A/2.0 Technical
manual.
1.2 Definitions
The following mnemonics are used in this document.
ADC Analogue to Digital Converter
IIO Individual Input Optoisolator
PCB Printed Circuit Board
SCADA Supervisory Control And Data Acquisition
VIO Vital Indication Optoisolator
2. Overview
2.1 Monitoring (How does it operate?)
Once every 0.25 seconds the Level Crossing monitor scans all of it’s
inputs. It then checks the pre-programmed relationships between its
analogue inputs, digital inputs and it's digital outputs.