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?