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and has no arguments. If the argument of the IF command evaluates false, the controller will skip commands until
the ELSE command. If the argument for the IF command evaluates true, the controller will execute the commands
between the IF and ELSE command.
Nesting IF Conditional Statements
The DMC-40x0 allows for IF conditional statements to be included within other IF conditional statements. This
technique is known as ‘nesting’ and the DMC-40x0 allows up to 255 IF conditional statements to be nested. This is
a very powerful technique allowing the user to specify a variety of different cases for branching.
Command Format - IF, ELSE and ENDIF
Format: Description
IF conditional statement(s) Execute commands proceeding IF command (up to ELSE command) if
conditional statement(s) is true, otherwise continue executing at ENDIF
command or optional ELSE command.
ELSE Optional command. Allows for commands to be executed when argument
of IF command evaluates not true. Can only be used with IF command.
ENDIF Command to end IF conditional statement. Program must have an ENDIF
command for every IF command.
Example using IF, ELSE and ENDIF:
#TEST Begin Main Program “TEST”
II,,3 Enable input interrupts on input 1 and input 2
MG “WAITING FOR INPUT 1, INPUT 2”
Output message
#LOOP Label to be used for endless loop
JP #LOOP Endless loop
EN End of main program
#ININT Input Interrupt Subroutine
IF (@IN[1]=0) IF conditional statement based on input 1
IF (@IN[2]=0) 2 nd IF conditional statement executed if 1 st IF conditional true
MG “INPUT 1 AND INPUT 2 ARE ACTIVE” Message to be executed if 2 nd IF conditional is true
ELSE
ELSE command for 2 nd IF conditional statement
MG “ONLY INPUT 1 IS ACTIVE Message to be executed if 2 nd IF conditional is false
ENDIF End of 2 nd conditional statement
ELSE ELSE command for 1 st IF conditional statement
MG”ONLY INPUT 2 IS ACTIVE” Message to be executed if 1 st IF conditional statement is false
ENDIF End of 1 st conditional statement
#WAIT Label to be used for a loop
JP#WAIT,(@IN[1]=0) | (@IN[2]=0) Loop until both input 1 and input 2 are not active
RI0
End Input Interrupt Routine without restoring trippoints
Subroutines
A subroutine is a group of instructions beginning with a label and ending with an end command (EN). Subroutines
are called from the main program with the jump subroutine instruction JS, followed by a label or line number, and
conditional statement. Up to 8 subroutines can be nested. After the subroutine is executed, the program
sequencer returns to the program location where the subroutine was called unless the subroutine stack is
manipulated as described in the following section.
Example:
An example of a subroutine to draw a square 500 counts per side is given below. The square is drawn at vector
position 1000,1000.
Chapter 7 Application Programming ▫ 127 DMC-40x0 User Manual