现有程序如下，帮分析下
A #step_2
JCN End1
L #PrgPointer
L 10
*I
SLW 3
LAR1 //Load AR1 with program pointer
L #DB_NUM_PROG
T #DB_Prog
OPN DB [#DB_Prog] //Open DB program
L DBW [AR1,P#8.0]
T #Funct_Nbr //Function Number
L DBD [AR1,P#0.0]
T #Setpoint_Position //setpoint position
L DBW [AR1,P#4.0]
T #Setpoint_Speed //setpoint speed
L 0
==I
JC Tval //jump if setpoint_speed=0
L DBW [AR1,P#14.0]
T #Next_Setpoint_Speed //load Next setpoint speed

Tval: L DBW [AR1,P#6.0]
T #TV_Stop //stop timer value
End1: NOP 0