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

General current change events occur based on the percentage change specified in the

expressions.

An example is:

Thu 07-04-94 03:51:01.0 A 8 B_TEST_I 7.53 amps

7.2.4.4 Temperature

Temperature change events occur based on the percentage specified in the expressions.

An example is:

Thu 07-04-94 03:51:01.0 A 7 Ambient 28.53 degrees

7.2.5 Connection status

A connection status log entry identifies when someone has either remotely or locally

connected or disconnected a computer to the level crossing monitor.

Examples of the connection status of a serial port changing is:

Wed 06-04-94 22:09:09.4 Serial Port A connected

Wed 06-04-94 22:10:27.4 Serial Port A disconnected

7.3 Analysis

Analysis of multiple log entries requires a knowledge of the Boolean expressions with

which the level crossing monitor has been configured.

An example is the following set of log entries:

Tue 08-03-94 10:43:37.2 D 16 LOW_BATT 0

Tue 08-03-94 10:43:37.2 D 58 NO_LX_FAULT 0

Tue 08-03-94 10:43:37.2 D 61 BATTERY 1

Tue 08-03-94 10:43:37.2 I 20 *DO_FAULT 1

The input LOW_BATT has become false. This caused the Intermediate variable

*DO_FAULT to become true due to the Boolean expression upon which *DO_FAULT is

based. This in turn caused the output NO_LX_FAULT to become false which is indicated

on the front panel of the monitor and also is reported to the Control Centre. The input

LOW_BATT has become false also caused the output BATTERY to become true due to

its Boolean expression. BATTERY is used to indicate the type of fault that has occurred.

Note that the because all the events occurred in the same 0.25 scan the order in the log

is based on the scan order and not the order in which the events occurred.

An extract for a typical level crossing operation is as follows:

Wed 15/06/94 07:05:50.7 D 2 DXT 0

Wed 15/06/94 07:05:50.7 D 7 XR 0

Wed 15/06/94 07:05:50.7 D 8 XPR 0

Wed 15/06/94 07:05:50.7 I 10 *LAMPS_ON 1

Wed 15/06/94 07:05:50.7 I 13 *TRACK_UP 0

Wed 15/06/94 07:05:53.4 A 4 CS_LAMPS FU 3

Wed 15/06/94 07:05:54.2 A 2 SS_LAMPS FD 4

Wed 15/06/94 07:05:54.2 A 4 CS_LAMPS FD 3

Wed 15/06/94 07:05:54.9 A 2 SS_LAMPS FU 4

Wed 15/06/94 07:05:58.7 A 0 Battery 13.83 Volts

Wed 15/06/94 07:06:10.6 T 16 NORM_APP_T 1