B&B Electronics VFG3000 - Manual - Manual (Page 164)

P ROGRAMMING T IPS V LINX F IELDBUS G ATEWAY M ANAGER U SER M ANUAL
P AGE 148
The example below shows an if statement with two actions…
if( TankEmpty ) {
StartPump := 0;
OpenValue := 1;
}
The example below shows an if statement with an else clause…
if( MotorHot )
StartFan := 1;
else
StartFan := 0;
Note that it is very important to remember to place the curly-brackets around groups of
actions to be executed in the
if or else portion of the statement. If you omit the brackets,
Fieldbus Gateway Manager 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.
S WITCH S TATEMENTS
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;
}