Specifications

RailCorp Engineering Manual — Signals — Equipment Manual

Cerberus Level Crossing Monitor Field Equipment Manual TMG E1261

Issued August 2012 UNCONTROLLED WHEN PRINTED Version 2.1

x is a internal variable which was declared in the IO list as a Timer.

=T identifies that it is a Timer expression.

Ah is length of the timer in hours. A is the number of hours in the range of 0 to 255 and h

identifies that A is the number of hours. Ah is optional when the timer length is less than

one hour.

Bm is length of the timer in minutes. B is the number of minutes in the range of 0 to 59

and m identifies that B is the number of minutes. Bm is optional when the timer length is

less than one minute.

Cs is length of the timer in seconds. C is the number of seconds in the range of 0 to 59

and s identifies that C is the number of seconds. Cs must always be declared even when

C is 0.

y is a Boolean expression as described previously.

Example Timer Expressions:

; Check that a local or remote test of LX is done within 36hrs of previous test

*NO_TEST =T 36h 0m 0s !BATT_TEST_OP & TEST_ZK

; Check AC supply

*AC_SUP_WAR =T 6h 30m 0s !AC_SUPPLY

; warn if AC supp out longer than 6hrs 30 min

; Low battery timer

*LOW_BATT_TIMER =T 3s !BATT_ALARM_CARD + *BATT_LOW

; time delay before low batt

6.1.2.10 Lamp expression

A lamp expression is used to configure the system with the analogue channel a particular

set of level crossing lamps are being monitored by, the number of lamps expected when

the flasher is in the UP position, the number of lamps expected when the flasher is in the

DOWN position.

Lamps expressions have the following format:

x =L A B C u

where

x is a internal variable which was declared in the IO list as a Lamp.

=L identifies that it is a Lamp expression.

A is the analogue channel in the range of 1 to 7 that is used to monitor the particular set

of lamps. Typically Channel 2 is used for the Sydney side lamps, 4 is used for the

Country side lamps, 3 is used for the Sydney side tip lights for booms, and 5 is used for

Country side tip lights for booms.

B is the number of lamps expected when the lamps are operating and the flasher is in the

UP state. The number must be in the range of 0 to 4. This is the number of lamps when

a steady set of lamps is being monitored.