This signal is transmitted from vehicle to DCU within the message Veh_DCU_#1, a mask is applied to the signal value to extract information:

Signal value	Description
0000	No obstruction security's disabled.
xxx1	Sensitive edge inner/left disabled.
xx1x	Sensitive edge outer/right disabled.
x1xx	Light Barrier #1 disabled.
1xxx	Light Barrier #2 disabled.