DMC-1500 Chapter 7 Application Programming • 81
Program Format
A DMC-1500 program consists of DMC-1500 instructions combined to solve a machine control
application. Action instructions, such as starting and stopping motion, are combined with Program
Flow instructions to form the complete program. Program Flow instructions evaluate real-time
conditions, such as elapsed time or motion complete, and alter program flow accordingly.
Each DMC-1500 instruction in a program must be separated by a delimiter. Valid delimiters are the
semicolon (;) or carriage return. The semicolon is used to separate multiple instructions on a single
program line where the maximum number of instructions on a line is limited by 38 characters. A
carriage return enters the final command on a program line.
Using Labels in Programs
All DMC-1500 programs must begin with a label and end with an End (EN) statement. Labels start
with the pound (#) sign followed by a maximum of seven characters. The first character must be a
letter; after that, numbers are permitted. Spaces are not permitted.
The maximum number of labels allowed on the DMC-1500 series controller is 254.
Valid Labels
Label
#BEGIN
#SQUARE
#X1
#Begin1
Invalid Labels
Label Problem
#1Square Can not use number to begin a label
#SQUAREPEG Can not use more than 7 characters in a label
Program Example:
Instruction Interpretation
#START Beginning of the Program
PR 10000,20000 Specify relative distances on X and Y axes
BG XY Begin Motion
AM Wait for motion complete
WT 2000 Wait 2 sec
JP #START Jump to label START
EN End of Program
The above program moves X and Y 10000 and 20000 units. After the motion is complete, the motors
rest for 2 seconds. The cycle repeats indefinitely until the stop command is issued.
Special Labels
The DMC-1500 has some special labels, which are used to define input interrupt subroutines, limit
switch subroutines, error handling subroutines, and command error subroutines. See section on
”
Automatic Subroutines for Monitoring Conditions” on page 95.
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