Manual
VEK S4
FEIG ELECTRONIC GmbH
03/09
9
•
Amplitude factor
The loss of sensitivity due to abnormal loop dimensions, long loop lines or road surface reinforcements is
largely compensated for using the amplitude factor. Automatic evaluation of this factor is also available.
•
Length adjustment
The measured vehicle length is corrected with the length adjustment. No vehicle length adjustment is usually
required for normal loops according to TLS with loop lines up to 100 metres.
•
Loop length
The loop type of the connected loops is adjusted using the loop length. Currently only the loop types TLS I
and TLS II according to the TLS 2002 guidelines are supported. The loop type TLS II is assumed for a length
up to 125 cm. The loop type TLS I is set for lengths of more than 125 cm.
loop
llenght
K
opf
abs
tand
loop 3
loop 4
loop 1
loop 2
Classifaction-
modul 1
Classifaction-
modul 2
Signals
OpenCollector 3
C
ount
e
r ev
er
c
la
s
s
an
d dir
e
c
to
in
OpenCollector 4
OpenCollector 1
OpenCollector 2
Loop allocation
is firm
Co
unt
e
r ev
er
c
las
s
an
s
dir
e
c
tio
n
Augangszuordnung
is firm
•
Output signals
As already described in 1.4 Possible outputs, each classification module can control two outputs. Refer to
the diagram above for their assignment. One of the five available functions can be set for each output.
Outputs can also be deactivated.
•
Vehicle counter
Each classification module has a 16-bit counter per vehicle class and travel direction which can be invoked
via the RS485 interface. It must be noted that the counters roll over at 65535 (2
16
) and restart from 0. It is not
recommended to reset the counters otherwise vehicles can be lost at the time of the reset. The counters in
the detector are not protected against power failure. The detectors must either be buffered with a UPS
system or the counter readings must be regularly read and stored in the higher level system for long-term
counting.
