【求教】想做一个方波的函数

*DEL,_FNCNAME
*DEL,_FNCMTID
*DEL,_FNCCSYS
*SET,_FNCNAME,'sinn'
*SET,_FNCCSYS,0
! /INPUT,sinn.func
*DIM,%_FNCNAME%,TABLE,6,4,1,,,,%_FNCCSYS%
!
! Begin of equation: sin(376.991112*{TIME})
*SET,%_FNCNAME%(0,0,1), 0.0, -999
*SET,%_FNCNAME%(2,0,1), 0.0
*SET,%_FNCNAME%(3,0,1), 0.0
*SET,%_FNCNAME%(4,0,1), 0.0
*SET,%_FNCNAME%(5,0,1), 0.0
*SET,%_FNCNAME%(6,0,1), 0.0
*SET,%_FNCNAME%(0,1,1), 1.0, -1, 0, 376.991112, 0, 0,
1
*SET,%_FNCNAME%(0,2,1), 0.0, -2, 0, 1, -1, 3, 1
*SET,%_FNCNAME%(0,3,1), 0, -1, 9, 1, -2, 0, 0
*SET,%_FNCNAME%(0,4,1), 0.0, 99, 0, 1, -1, 0, 0
! End of equation: sin(376.991112*{TIME})
!-->
*set,key,0
*set,flag,%sinn%
*if,flag,GT,0,THEN
*set,key,200000
*endif
我想set大概不能用，*set,flag,%sinn%,这句应该怎么改才能达到目的啊。
各位英雄帮忙啊。