Anti-Passback

Controlling flow and occupancy

Overview

• Named after ‘passback’ – passing back a card after going through a door / gate

/ turnstile

• FEATURES:– Preventing misuse of cards– Tracking and/or restricting the number of people in an

area– Triggering system events based on area occupancy– Interlocking of reader use based on the cardholder

location

Site Suitability

• Determine Entry/Exit points– Must be controlled = No ‘sneaking’ in/out

• Controller Grouping– GAPB areas can be used across multiple controllers

• Preparedness for violations– Who will fix the problems?

• Type of enforcement– Soft & timed options

Site Suitability

Misuse / Flow Control

Misuse / Flow Control

Track / Restrict

• Maintains count of people in area

• Two man rule (minimum occupancy)

• Restrict maximum occupancy

Event Triggers

• Control system based on occupancyExample: Display area status by lights connected to relay

1. Create Internal Variable(s) for relay control

Event Triggers, cont.2. Assign Internal Variable to APB area with occupancy requirement

Interlocking

• Must enter an area before using readers in the area

Interlocking, cont.

Global Anti-Passback• Allows Anti-Passback to cover whole site no matter how

many controllers.

• Uses software in addition to hardware to track cardholders

at all times

Area 1

Controller A

Area 2

Controller B

Global Area ‘OUT’

1. Cardholder must Exit Area 1

2. Then can Enter Area 2

Area Control• Areas can be monitored and controlled in Alarm mode• Operator can control the area (open/close) can also

move users or grant free pass

Reset/Closing

• Resetting status will put allow all users one ‘free pass’– Next card read will determine area– Doesn’t empty an area

• Users can be granted ‘free pass’ individually

• Areas can be closed which will not allow entry—exit is still allowed– Controlled by Internal Variable– Can be manually closed in Alarm Mode

Area Types

• Each type of Global Area can have a separate type to simplify Mustering

Hazardous - An area that should be evacuated in the case of an emergency on the site. Hazardous areas can contain Sub Areas as well as have Safe Areas linked to them. Normal - An area that is not subject to evacuation in case of an emergency. The standard type for all areas if mustering is not used in the system. Safe - An area, such as a muster point or safe haven, where cardholders should report in case of an emergency on-site.

Mustering• The goal of mustering is to move all

people out of hazardous areas and have an accurate count of who might remain

Mustering Reports

• Historical Mustering can show status of area at a point back in time

What about…?

• What type of Anti-passback control is suitable for large perimeters?

• How to set up a suitable mustering plan?

• What cases might make anti-passback unreliable?