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DMC-18x2
Chapter 7 Application Programming • 123
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
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.
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