Specifications
RailCorp Engineering Manual — Signals — Equipment Manual
Cerberus Level Crossing Monitor Field Equipment Manual TMG E1261
© RailCorp Page 66 of 89
Issued August 2012 UNCONTROLLED WHEN PRINTED Version 2.1
64. An I configures the word as Inputs, and an O configures the word as
outputs. The standard value for this is "IIIIIIIO".
For example a normal configuration file will contain:
; station board_address BOARD CONFIGURATION
;
01 01 IIIIIIIO
6.1.2.6 Expression data name
The expression data name is the first non-comment line in the ".exp" configuration data
file. The first 40 characters of this line appear in the Level Crossing monitor EPROM.
They are used to identify the configuration data in use by a particular level crossing
monitor.
The first non-comment line of the ".exp" file must be the Level Crossing name and the
date of the last alteration to the particular configuration data files. The normal format is
“000 Generic, Generic Rd 000.00 07/09/94”.
Where :
000 is the Level Crossing ID number.
Generic, Generic Rd is the Location and Road name.
000.00 is the Kilometreage.
07/09/94 is the date
Refer to Section 7.3 Customising Generic expressions for details of the allocation of
Level Crossing ID numbers.
6.1.2.7 Boolean Expressions
Boolean expressions are combinations of logic operations on Boolean variables. Boolean
variables may have either of two values or states. One of these states is called TRUE,
ON, or 1. The other state is called FALSE, OFF, or 0.
In relay terms TRUE is equivalent to UP, and FALSE is equivalent to DOWN.
The level crossing monitor uses Boolean expressions to derive different logic states of
the level crossing in order to determine the whether or not the level crossing is operating
correctly.
There is a direct correspondence between relay circuits and Boolean expressions. The
Boolean expressions will be related to relay circuit as a way of describing their operation.
6.1.2.7.1 AND Operator
The logical AND operation is represented by the "&" character.
Examples of logical AND operations are as follows:
Either as relay logic by: