Campbell DSP4 Especificaciones descargar pdf (Pagina 132)

Section 5. Program Declarations

5-8

constants (i.e., do not contain a variable) into some of the

variables. If a constant is passed, the “variable” it is

passed to becomes a constant and cannot be changed by

the subroutine. If constants will be passed, the subroutine

should be written to not try to change the value of the

“variables” they will be passed into.

statementblock Any group of statements that are executed within the body

of the Subroutine.

Exit Sub Causes an immediate exit from a Subroutine. Program

execution continues with the statement following the

statement that called the Subroutine. Any number of Exit

Sub statements can appear anywhere in a Subroutine.

End Sub Marks the end of a Subroutine.

A Subroutine is a procedure that can take variables, perform a series of

statements, and change the value of the variables. However, a Subroutine can't

be used in an expression. You can call a Subroutine using the name followed

by the variable list. See the Call statement for specific information on how to

call Subroutines.

Caution Subroutines can be recursive; that is, they can call themselves to

perform a given task. However, recursion can lead to strange

results.

Subroutine Example

'CR3000

'Declare Variables used in Program:

Public RefT, TC_C(4), TC_F(4), I

'Data output in deg C:

DataTable (TempsC,1,-1)

DataInterval (0,5,Min,10)

Average (1,RefT,FP2,0)

Average (4,TC_C(),FP2,0)

EndTable

'Same Data output in F :

DataTable (TempsF,1,-1)

DataInterval (0,5,Min,10)

Average (1,RefT,FP2,0)

Average (4,TC_F(),FP2,0)

EndTable

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Campbell DSP4 Especificaciones Pagina 132