Automatic Systems
PNG38X-A3_1-04-gb-02.doc
10/12/01
p. 20/51
4.2.1.2. “Tailgating” Fraud:
One or several persons without passage authorisation follow(s) another user who has presented a valid
ticket. The buzzer is immediately activated. One of the three following situations is selected when
programming the PNG (see paragraph
[4.3. PNG configuration]
):
a. “Tailgating” Fraud prior to passage through doors (fig. 13b)
If two presence zones, each comprising at least two activated cells and separated by at least one
inactivated cell, are detected, "tailgating" fraud alarm is activated:
-
the doors close in front of the authorized person unless the security zone is activated,
-
the buzzer is activated,
-
the pictograms show a red cross.
The alarm ends when there are no more than one zone detected and after a short time-out (% TM6)
(1 sec by default). The doors will reopen if the authorized person has not passed through.
Two cells per presence zone are default but may be changed to 1 (by means of the console)
separately for corridor A and corridor B: parameter
%MW21
or %MW22
.
b.
Fraud zone before passage through doors (fig 13c)
If the number of activated cells within the same entrance zone exceeds a maximum value, the
“tailgating” fraud alarm is activated:
- the doors close in front of the authorized person unless the security zone is activated,
- the buzzer is activated,
- the pictograms show a red cross.
The alarm ends when the number of activated cells will not more exceed the maximum value and
after a short time-out (% TM6) (1 sec by default). The doors will reopen if the authorized person has
not passed through.
The maximum value is fixed at 6 by default, no fraud detection zone is possible by default. But this
maximum value may be adapted between 1 and 6 (by means of the console): parameter
%MW30.
c.
Nota Bene:
The “tailgating” fraud will only be operational with the default values for the extension corridor (PNG
381 or PNG382).
“Tailgating” fraud before passage may be made operational for PNG 380 by modifying the parameter
values
%MW30, %MW21
and/or
%MW22
to 1 but bear in mind that there will consequently be a
significant risk of false alarms.
ALARM
Fig. 13 b
2 activated cells minimum
Non activated
cell
Fig. 13 d
Security cells not activated
Fig. 13 c
zone with 6 activated cells
ALARM
“Tailgating” Fraud
A3
A3
A3
