Heal parameter at 0 in precision landing

ArduCopter Copter 4.1
1

I am trying precision landing using IRLOCK and arducopter 4.1.1.
I set up PLND parameters like as follows

mission planner PLND values
mission planner PLND values733×399 86.8 KB

IRLOCK firmware is MarkOne_1.0.1.hex and I checked the sensor was tracking beacon well using PixyMon version 1.0.2.
Lidar is working great and GPS has 3D Lock.
However, while revewing logs, all “PL” parameters are at 0 (except timestamp).