Why the control output is wrong?

[wjxylsl]

My FDS code is :
&MESH XB = 0 3 0 1 0 2 IJK = 30 10 20 /
&TIME T_END = 10 /
&SURF ID = 'FIRE' HRRPUA = 600 COLOR = 'RED' /
&REAC FUEL = 'PROPANE' /
&VENT XB = 0.4 0.6 0.2 0.4 0 0 SURF_ID = 'FIRE'/

&DEVC ID = 'S_1' XYZ = 0.5 0.5 1.9 QUANTITY = 'TEMPERATURE' SETPOINT = 60 /
&DEVC ID = 'S_2' XYZ = 1.5 0.5 1.9 QUANTITY = 'TEMPERATURE' SETPOINT = 60 /
&DEVC ID = 'S_3' XYZ = 2.5 0.5 1.9 QUANTITY = 'TEMPERATURE' SETPOINT = 60 /

&CTRL ID='SD1', FUNCTION_TYPE='ONLY', N=1, INPUT_ID='S_1','S_2','S_3' /
&CTRL ID='SD2', FUNCTION_TYPE='ONLY', N=2, INPUT_ID='S_1','S_2','S_3' /
&CTRL ID='SD3', FUNCTION_TYPE='ONLY', N=3, INPUT_ID='S_1','S_2','S_3' /

Why the 3 controls have the same result?

[drjfloyd]

A bug that has been there for a very long time that I am surprised hasn't been discovered yet. I'll fix. As a work around for N=1 you could use OR, for N=3 ALL, and for N=2 you could create three ALL functions for all the pairs and then an OR function for the three pairs.

[wjxylsl]

Thanks，drjfloyd.