Automatic control function programming manual ladder language

16.4.3 Exchange Area
Programming in C Language
All the variables of the exchange area (see Chapter 3) are accessible for programming in C. The exchange area is
defined in header file NUM.H.
It is necessary to include file NUM.H at the beginning of the source files that will be using the exchange area.
File NUM.H is divided into four areas, validated by the following definitions:
- the exchange area is validated by «#define VariablesLAD»,
- the transparent mode function area is validated by «#define NCScreen»,
- the grafcet formalism area is validated by «#define Grafcet»,
- the file management area is validated by «»#define File_Management».
Example
To use the exchange area
#define VariablesLAD
#include
To use the exchange area and transparent mode functions
#define VariablesLAD
#define NCScreen
#include
16.4.4 Accessing the Saved Common Internal Variables
These byte, word or long word variables are accessible by the following keywords:
Keyword Value Definition
_MB(a) 0 < to < 77FF Signed byte
_MW(a) 0 < to < 77FE Signed word
_ML(a) 0 < to < 77FD Signed long word
It is also possible to access data by the address (equivalent to the .& ladder operator).
Keyword Value Definition
_pM(a) 0 < to < 77FF
16.4.5 Accessing Unsaved Common Internal Variables
These byte, word or long word variables are accessible by the following keywords:
Keyword Value Definition
_VB(a) 0 < to < 77FF Signed byte
_VW(a) 0 < to < 77FE Signed word
_VL(a) 0 < to < 77FD Signed long word
It is also possible to access data by the address (equivalent to the .& ladder operator).
Keyword Value Definition
_pV(a) 0 < to < 77FF
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