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Engineering Standard –NSW

Signalling SMS 02

Cerberus Level Crossing Monitor Equipment

March 2005 Version 1.2 © Australian Rail Track Corporation Page 87 of 118

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or as a Boolean expression

D = [!A + B] & C

D will be true when C is true and [ A is not true or B is

true]. 7.1.2.8 Steady result expression

Intermediate variables and Output variable are controlled by steady

result expressions. These variables become TRUE (or ON) when the

steady result expression controlling the variable becomes TRUE. The

variables become FALSE (or OFF) when the steady result expression

controlling the variable becomes FALSE.

Steady result expressions have the following

format: x = y

where

x is variable which was declared in the IO list as either an

Intermediate or an Output.

= identifies the expression as being a steady result type of

expression.

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Dataplex DPX-213 Especificaciones Pagina 87