Interlogix ATS1170 Programming Manual page 10

Removing a card from the onboard user database:
To remove a card from the ATS1170 database, the card format and type must
match the card and DIP switch A is set to On.
To remove a card, badge it six times. One long beep is sounded when the card is
removed from the onboard user database.
10 ATS1170 One Door RAS Programming Guide