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

The state for outputs is either "0" or "1". "0" means that the output is OFF. "1" means that

the output is ON. If the name is prefixed by "NO_" then the output state represents the

inverse of the sense.

Examples of an output changing state are:

Tue 08-03-94 10:40:26.7 D 63 LOGIC 0

Mon 14-03-94 15:18:48.2 D 63 LOGIC 1

7.2.2 Intermediate variables

A log entry type of "I" means that the log entry is for an Intermediate variable. Numbers in

the range of 1 to 10 are special Intermediate variable which are controlled by the Level

Crossing Monitor software. Numbers in the range 11 to 32 are Intermediate variables

which are controlled by Boolean expressions.

The state for Intermediate variables is either "0" or "1". "0" means that the Intermediate

variable is OFF or has a logical state of FALSE. "1" means that the Intermediate variable

is ON or has a logical state of TRUE.

Examples of an Intermediate variable changing state are:

Wed 06-04-94 22:09:09.4 I 10 *LAMPS_ON 1

Wed 06-04-94 22:10:27.4 I 10 *LAMPS_ON 0

7.2.3 Timers

A log entry type of "T" means that the log entry is for an Timer variable. Numbers in the

range of 1 to 3 are special Timer variables which are controlled by the Level Crossing

Monitor software. Numbers in the range 4 to 22 are Timer variables which are controlled

by Boolean expressions.

The state for Timer variables is either "0" or "1". "0" means that the Timer variable is OFF

or has a logical state of FALSE. "1" means that the Timer variable is ON or has a logical

state of TRUE. The Timer will only become TRUE when the controlling Boolean

expression has been TRUE for the Timer length.

Examples of an Timer variable changing state are:

Mon 07-03-94 12:16:22.3 D 2 DXT 0

Mon 07-03-94 12:16:42.1 T 19 NORM_APP_T 1

Mon 07-03-94 12:16:58.3 D 2 DXT 1

Mon 07-03-94 12:16:58.8 T 19 NORM_APP_T 0

Note that the DXT becoming "0" starts the 20 second NORM_APP_T timer which

becomes TRUE 20 seconds later. The DXT becoming "1" cancels the NORM_APP_T

timer which becomes FALSE shortly afterwards.

7.2.4 Analogue

A log entry type of "A" means that the log entry is for an Analogue event. There are four

types of analogue events. These are Voltage, Lamp, Current, and Temperature events.

The number identifies the analogue channel for which the event occurred.

The state is different for each analogue event type and is a means of identifying the

different types.

States of the form "nn.mm volts" are for battery voltage and voltage change events.