Denso Power Net Terminal BHT-103 Dokumentacja Pobierz pdf (Strona 187)

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■ Calling a user-defined function (

SUB function)

This statement calls a user-defined function specified by functionname. You

may omit

CALL when calling a SUB function.

•

functionname should be a user-defined function defined by SUB...END SUB

statement.

• The number of

realparameters should be equal to that of dummyparame-

ter

s, and the types of the corresponding variables used in those parameters

should be identical.

• If you specify a global variable in

realparameter when calling a user-defined

function, the user-defined function cannot update the value of the global variable.

This is because all

realparameters are passed not by address but by value.

(So called "Call-by-value")

Syntax errors:

NOTE

Before any call to a SUB function, you need to place definition of the SUB

function or declaration of the SUB function by using the DECLARE state-

ment in your source program.

Error code and message Meaning

error 3: ’"’ missing

No double quote precedes or follows

[drivename:]filename.

error 68: Mismatch

• The number of real parameters is not

equal to that of the dummy parameters.

•

dummyparameter was an integer

variable in defining a function, but

realparameter is a real type in call-

ing the function. (If a dummy parameter

was a real variable in defining a function

and

realparameter is an integer

type in calling, then no error occurs.)

error 71: Syntax error • [drivename:]filename is not

enclosed in double quotes.

• The function specified by

function-

name

has not been defined.

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