csmstr - Omega Engineering

CONFIGURING PROGRAMS
PROGRAMMING TIPS
Crimson will most likely misunderstand exactly which actions you want to be dependent
upon the if condition. Although line breaks are recommend between actions, they are not
used to figure out what is and is not included within the conditional statement.
SWITCH STATEMENTS
A switch statement is used to compare an integer value against a number of possible
constants, and to perform an action based upon which value is matched. The exact syntax
supports a number of options beyond those shown in the example below, but for the vast
majority of applications, this simple form will be acceptable.
The architecture of the switch statement is as follow…
switch ( int var) {
case 1:
action1;
break;
case 2:
action2;
…
default:
action3;
break;
}
This example below will start a motor selected by the value in the MotorIndex tag...
switch( MotorIndex ) {
case 1:
MotorA := 1;
break;
case 2:
case 3:
MotorB := 1;
break;
case 4:
MotorC := 1;
break;
default:
MotorD := 1;
break;
}
A value of 1 will start motor A, a value of 2 or 3 will start motor B, and a value of 4 will start
motor C. Any value which is not explicitly listed will start motor D. Things to note about the
syntax are the use of curly-brackets around the case statements, the use of break to end each
conditional block, the use of two sequential case statements to match more than one value,
and the use of the optional default statement to indicate an action to perform if none of the
specified values is matched by the value in the controlling expression. (If this syntax looks
REVISION 6 PAGE 231