LP21/LP22
Pag.
28
a
37
LP21/LP22 Installation instructions en
Sensors
9.7
Setting direction detection (dual-channel variants)
Complex evaluation algorithms are integrated into the dual-channel detector for direction-dependent
recording of vehicles over double loops. The direction logic generates logical output signals that are given
out over the outputs depending on the setting. Parallel to this, the detector autonomously counts the logic
signals.
Fig.9: Direction detection principle
Symbol
Description
Dir A, Dir B
Direction A: Loop
1→Loop 2 or direction B: Loop 2→1
L1, L2
Loop 1 or 2
Out A, Out B
Signal output direction A or B
LM
Logic module
LOC
Loop coverage counter
DLC
Direction logic counter
Tab.20: Key to symbols
Direction logic system
• With all the logics, the first loop covered determines the direction of counting or of travel. If loop 1 is
covered first, the signal output and counting is done for direction A (see chapter 9.8 "Setting direction
logic (dual-channel variants)", page 29).
NOTE
Counter readings in the Detector Tool
• It should be noted that the counter overflows at 65,535 (2
16
) and is automatically erased.
• The counter readings are not protected against power failure!
DIP
Direction detection
OFF
Switched off (factory settings)
ON
Switched on
Tab.21: Setting direction detection
