Automatic control function programming manual ladder language

16.4.9 Library Functions
Programming in C Language
An application written in C is generated on a separate system. The NUM.OBJ function library gives access to the
monitor primitives. This library is used during link editing.
All these functions are prototyped in the NUM.H header file.
16.4.9.1 System Functions
Export an Object EXPORT
Syntax
symbol: Character string.
symbol_addr: Symbol address.
SINT32 EXPORT(SINT8 *symbol, void *symbol_addr)
This function makes a C object visible to all the other modules (total visibility) or associates a function with a PLC task.
Report:
- 0 = OK
- -1 = task already defined or too many export symbols.
Example 1
This export instruction associates ts01_in_C with task TS01.
main()
{
EXPORT(«TS01»,ts01_in_C);
}
void ts01_in_C()
{
function body
}
Example 2
This export instruction makes «table» completely visible.
SINT16 table[100];
main()
{
EXPORT(«LABEL»,table);
}
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