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USER MANUAL Chapter 7 Application Programming • 121
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.
#M Begin Main Program
CB1 Clear Output Bit 1 (pick up pen)
VP 1000,1000;LE;BGS Define vector position; move pen
AMS Wait for after motion trippoint
SB1 Set Output Bit 1 (put down pen)
JS #Square;CB1 Jump to square subroutine
EN End Main Program
#Square Square subroutine
V1=500;JS #L Define length of side
V1=-V1;JS #L Switch direction
EN End subroutine
#L;PR V1,V1;BGX Define X,Y; Begin X
AMX;BGY;AMY After motion on X, Begin Y
EN End subroutine
Stack Manipulation
It is possible to manipulate the subroutine stack by using the ZS command. Every time a JS
instruction, interrupt or automatic routine (such as #POSERR or #LIMSWI) is executed, the subroutine
stack is incremented by 1. Normally the stack is restored with an EN instruction. Occasionally it is
desirable not to return back to the program line where the subroutine or interrupt was called. The ZS1
command clears 1 level of the stack. This allows the program sequencer to continue to the next line.
The ZS0 command resets the stack to its initial value. For example, if a limit occurs and the #LIMSWI
routine is executed, it is often desirable to restart the program sequence instead of returning to the
location where the limit occurred. To do this, give a ZS command at the end of the #LIMSWI routine.
Auto-Start Routine
The DMC-13X8 has a special label for automatic program execution. A program which has been
saved into the controllers non-volatile memory can be automatically executed upon power up or reset
by beginning the program with the label #AUTO. The program must be saved into non-volatile
memory using the command, BP.