I've done this with buttons, but not with EAC.
I guess the easiest way to do this would be to find a product that allows a really long relay time. Then it's treated almost like a door, you swiop the card, relay changes state for 20 minutes, shunt time of 25 minutes. After the 20 minutes expired a sounder/strobe goes off as a warning, if still no swipe after 25 minutes the auxillary relay will trip and trip an alarm panel output, or even e-mail depending on the system.
I'll see if I can fire up my keyscan client (only EAC manufacturer I really have any experience with) and see what kind of delay times they offer.
I don't know who does this, but it seems a fairly straightforward software feature to add to an EAC system. It strikes me the hardware is all already there, all you need is the business logic and data input for tracking:
- what user / card to monitor
- what times to monitor
- maximum time between check ins
With those three parameters, the system would simply check once a minute - for each user / card to monitor, if it is during the time to monitor, if the time now minus last time user has checked in is greater than the maximum time between check ins, generate an alert.
Which access system being used in their facility?
Nowdays it's common option in most of the access control system, see below reference...
Lenel Guard Tour (SWG-1130)
We can achieve the requirement by two method, if existing system is well-known brand we can aceive this function by upgrading their software OR we can try as per daniel idea with relay and timer...
Relays and timers, it's old school but it does work, haha
The functionality required somewhat like a guard tour but there can't be any predefined routes as the places and times the staff will be working will always change.
As for relays and timer this would be almost impossible as the facilities span a whole city and the shear size of the system is huge. PLC's maybe but I think it would be nice to use a EAC system rather then install more equipment.
Well an EAC system is essential a more advanced set of relays and timers...I meant using the EAC as the relay/timer.
This can be achieved through guard tour system... in one of the critical infra they use card readers for guard patrol. For example on the entire perimeter area they have installed around 10 card readers.
Every time guard will swipes the card with pin (when staring the patrol) which will activate the guard tour real-time alert in central control room. if he not swiped the card in next reader in perdermined time (10min), in central control room they get real-time alert of delay swipes. So they can take necessary next action such as monitor the location through CCTV/sent guards to check those areas to find out the reasion for delay.