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DMC-3425 Chapter 7 Application Programming• 149
The program reads the input voltage periodically and assigns its value to the variable VIN. To get a
speed of 200,000 ct/sec for 10 volts, we select the speed as
Speed = 20000 x VIN
The corresponding velocity for the motor is assigned to the VEL variable.
Instruction
#A
JG0
BGA
#B
VIN=@AN[1]
VEL=VIN*20000
JG VEL
JP #B
EN
Position Control by Joystick
This system requires the position of the motor to be proportional to the joystick angle. Furthermore,
the ratio between the two positions must be programmable. For example, if the control ratio is 5:1, it
implies that when the joystick voltage is 5 Volts, corresponding to 1028 counts, the required motor
position must be 5120 counts. The variable V3 changes the position ratio.
Instruction
Interpretation
#A Label
V3=5 Initial position ratio
DP0 Define the starting position
JG0 Set motor in jog mode as zero
BGA Start
#B
V1=@AN[1] Read analog input
V2=V1*V3 Compute the desired position
V4=V2-_TPA-_TEA Find the following error
V5=V4*20 Compute a proportional speed
JG V5 Change the speed
JP #B Repeat the process
EN End