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Analog speed control

Description

This program demonstrates the use of the analog input in a speed control application.

The program subroutine performs calculations using the user registers R1-R4 and slews the axis bi-directionally based upon the value seen on the analog input.

Hardware requirement: 10kΩ potentiometer connected to the Analog input.

The code shown on the right may be copied and pasted into the program editor window of the Motion Control Programmer application, or a zip file containing the program files may be downloaded below.

Requirements

Example program

Liberty* MCodeMDrive MCode

'LIBERTY* MDRIVE DEMO PROGRAM
'Last modified 02/21/2013
'Sample test program for demonstration purposes only
'Not tested or verified for safety or any function
CP   'preclear program memory
'[VARIABLES]
Os = 1, 20, 1 'Velocity changing output
A=2000000
D=2000000
R4=80
'[PROGRAMS]
'The main program block calls
'subroutine to calculate a slew rate
'based on the value of I5
PG 1   
  LB G1 
    R1 = I5        
    CL Z1
    SL R3
    H 10
    BR G1
  E
'Subroutine performs calculation
'to vary the velocity based upon 
'the analog input
LB Z1     
  R1 = R1-2032 
  R2 = 1   
  BR Z2, R1>=0
  R2 = -1
  R1 = R1 * R2
  
  LB Z2
    BR Z3,R1<R4
  R1 = R1 * 625
  R3 = R1 * R2
  RT
LB Z3
  R3=0
  RT 
E
PG 
S
'Keep this line to save program on load

'LIBERTY* MDRIVE DEMO PROGRAM

'Last modified 02/21/2013

'Sample test program for demonstration purposes only

'Not tested or verified for safety or any function

CP 'preclear program memory

'[VARIABLES]

Os = 1, 20, 1 'Velocity changing output

A=2000000

D=2000000

R4=80

'[PROGRAMS]

'The main program block calls

'subroutine to calculate a slew rate

'based on the value of I5

PG 1

LB G1

R1 = I5

CL Z1

SL R3

H 10

BR G1

'Subroutine performs calculation

'to vary the velocity based upon

'the analog input

LB Z1

R1 = R1-2032

R2 = 1

BR Z2, R1>=0

R2 = -1

R1 = R1 * R2

LB Z2

BR Z3,R1<R4

R1 = R1 * 625

R3 = R1 * R2

LB Z3

R3=0

'Keep this line to save program on load

'MDRIVE DEMO PROGRAM
'Last modified 02/21/2013
'Sample test program for demonstration purposes only
'Not tested or verified for safety or any function
CP   'preclear program memory
'[VARIABLES]
S1 = 20, 1, 0 'Velocity changing output
A=2000000
D=2000000
R4=80
'[PROGRAMS]
'The main program block calls
'subroutine to calculate a slew rate
'based on the value of I5
PG 1   
  LB G1 
    R1 = I5        
    CL Z1
    SL R3
    H 10
    BR G1
  E
'Subroutine performs calculation
'to vary the velocity based upon 
'the analog input
LB Z1     
  R1 = R1-508
  R2 = 1   
  BR Z2, R1>=0
  R2 = -1
  R1 = R1 * R2
  
  LB Z2
    BR Z3,R1<R4
  R1 = R1 * 2500
  R3 = R1 * R2
  RT
LB Z3
  R3=0
  RT 
E
PG 
S
'Keep this line to save program on load

'MDRIVE DEMO PROGRAM