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Chapter 4 Block Reference

FieldPoint FP-3000 User Manual 4-10 www.ni.com

Flow Control

Flow control and grouping constructs supported by the expression

language will be a variant of the C language designed to eliminate the

possibility for endless loops and other pathological cases. This variant

includes standard if...then...else statements and compositions.

Example:

//Conditional statement with an if...then clause

if (a_state_0 > 5) { //begin a composition

A_state_0 = 0;

A_state_1 = 5;

} //end composition

else //The else clause is optional and not required

a_state_0 = a_state_0 + 1; //else clause is not

required to be a composition.

Delimiters

Every valid program statement must be terminated using the C-language

style delimiter ‘;’.

For example,

a_in_0 = 0.0;

a_in_1 = 0.0;

Functions

Intrinsic Functions

The Expression block language provides a set of standard functions that

implement some higher math functions, as well as functions for controlling

the status of a value.

Table 4-4. Flow Control and Group Constructs

Operation Syntax

Conditional if (condition) <statement(s) to be executed for true

case>

[else<statement(s) to be executed for false case>]

for loop and while loop constructs are not supported

Composition { <statement> ; ... }

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 154 155

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National-instruments FP-3000 Manual de usuario Pagina 62