Vision VTB-101 Guia do Utilizador descarregar pdf (Página 29)

VTB USER GUIDE

6.9 Fixed Variables

The variables of type FIXED are allocated at a fixed address in the internal memory of the device which, unlike common

variables, doesn't change modifying the program. This type of variable simplifies the use of systems connected to an

external HOST (ex. PC). In fact using FIXED variables there will be no need to recompile the HOST application at each

change in VTB program.

FIXED variables are always GLOBAL that is visible in all page and in all tasks.

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

The START address of FIXED area is:

NGM13 - NGMEVO Addr= 536874496

NG35 Addr= 1051648

NGQ - NGQx Addr = 8389632

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 124 125

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