Vision VTB-101 Uživatelská příručka stáhnout pdf (Strana 21)

VTB USER GUIDE

6.2 Internal Variable

These variables are allocated in the VOLATILE MEMORY (RAM) of the system and are zeroed at reset.

The possible types managed by VTB reflects the main types defined in a lot of programming languages and they are

the following:

TYPE

DIMENSION

RANGE

BIT

1 bit

From 0 to 1

CHAR

8 bit signed

From –128 to +127

UCHAR

8 bit unsigned

From 0 to 255

INT

16 bit signed

From –32.768 to +32.767

UINT

16 bit unsigned

From 0 to 65.535

LONG

32 bit signed

From –2.147.483.648

to +2.147.483.647

FLOAT

64 bit (standard DOUBLE format IEEE 75)

From -1,79769313486232e308

to +1,79769313486232e308

STRING

Supported only as constant

VETTORE

Single dimension for all variable types

except BIT type

STRUCTURE

Standard declaration

POINTER

Char, Uchar, Int, Uint, Long, Float

32 bit

DELEGATE

Pointer to FUNCTIONS

32 bit

It's appropriate using variables according to the minimum an maximum value they have to contain choosing the best

appropriate. INTERNAL VARIABLES can be declared PAGE LOCAL or GLOBAL.

PAGE LOCAL VARIABLES declared inside the PAGE TASK and visible only to it

GLOBAL VARIABLES declare in MAIN TASK and visible to all the others

VTB doesn't make any control on dimension of the variables and on its assigned value.

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