Rockwell Automation 1789-L10_L30_L60 SoftLogix 5800 System User Manual - Manual (Page 144)

144 Rockwell Automation Publication 1789-UM002J-EN-P - December 2012
Chapter 7 Develop External Routines
Parameter Type Checking
Return Parameter
Only floating point and integer values can be returned from the external routine.
You cannot pass a pointer to a memory location as the return parameter. This is
enforced to maintain the integrity of the controller. Note that all memory that is
referenced by both the controller and an external routine must have been
allocated by the controller.
Export Functions by Using
C++ Export Style If you export your external routine functions by using the C++ export style, make
sure that the EntryPoint value in your XML resource exactly matches the C++
decorated name that is exported by your C++ compiler.
RSLogix 5000 Data Type Formal Parameter Enumeration Allowed C Language Types (XML)
Literal integer value (such as 121) IntegerValue Char, short, int, long, bool
DINT IntegerAddress
IntegerValue
VoidAddress Int*, long*
Int, long
Void*
INT IntegerAddress
IntegerValue
VoidAddress Short*
Short
Void*
SINT IntegerAddress
IntegerValue
VoidAddress Char*
Char
Void*
Literal floating point values (such as 12.345) FloatingPointValue Float
REAL FloatingPointAddress
FloatingPointValue
VoidAddress Float*
Float
Void*
BOOL IntegerAddress
IntegerValue
VoidAddress Bool*
Bool
Void*
Literal BOOL IntegerValue Bool
UDT StructureAddress
VoidAddress Struct AnyStructT* s
Void*
Arrays ArrayAddress
VoidAddress
Char var[], short var[], int var[], long var[], Bool var[],
float var[], struct AnyStructT var[]
Void*
RSLogix 5000 Data Type Formal Parameter Enumeration Allowed C language Types (in XML)
DINT IntegerValue Int
Long
INT IntegerValue Short
SINT IntegerValue Char
REAL FloatingPointValue Float
BOOL IntegerValue Bool