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Introduction

This rule represents a pattern that can be used to enable or disable entities or to control actions in response to track behaviour. Note that the timer input is required to ensure the actions do not flip-flop when different tracks are processed by rule. For example a track inside the area will meet the requirements of the area check and therefore the actions will be triggered, however the next track checked could be outside the area in which case the area check will fail and the actions will be reversed. To avoid the actions being continuously triggered and then reversed the timer is used to keep the area rule output true for the specified time period. This means as long as a track is in the area the timer period will be reset and the rule will remain broken until the track has left the area and the timer has expired.

This example demonstrates the ability to enable or disable another rule based on whether a track is detected in the specified area.

Configuration

Nodes

Inputs

  • Time Link:

    • Time Frame: this defines the length of time the rule will be disabled for. After e.g. 60 seconds, the rule will  become active again.

Check

Actions

  • Rule State:

    • Enabled: select to enable a disabled rule. Leave unchecked to disable an enabled rule. 

    • Rule: select the rule to enable/disable.

    • Action: Input. 

PPI Example

In this example Disable Rule, an Area Check disables another rule. The area is the Radar Area, in blue, and the rule is the Gate Rule. Here, track 166 enters the Radar Approach Area and therefore disables the Gate Rule; a rule which controls access to the Alarm Area (in purple). Track 167 approaches the Alarm Area.

Because the Gate Rule is disabled, track 167 does not trigger an alarm by breaking a rule in the Alarm Area. 

However, the Gate Rule was only disabled for 1 minute. Therefore, nine tracks (on identical paths to 167) and 60 seconds later, the Gate Rule is enabled and track 176 now breaks the rule and triggers an alarm in the Alarm Area. 

Related information

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Safety is everything.