LogicLib

Collaboration diagram for LogicLib:

Modules
	Application, symbols
	Extension of PLC functions by C/C++ implementation
	Read variable using symbols
	Write variable using symbols
	Read memory area
	Write memory area
	Version and Permission
	Structs, Types, ...

Detailed Description

This library contains functions to control and manage the logic runtime system on the target device. Furthermore, this library provides the symbolic read and write access to logic variables and the possibility to read and write memory areas such as the input area (like "%IB0" or "%QB0").

Attention

The addresses of the variables of the symbolic access might change on every download, reset origin or online change of the PLC application, so you have to stop each variable access before you load or change the PLC application!

Note

The LogicLib functions trace their debug information mainly into module the MLPI_LOGIC_LIB and in addition into the modules CMP_OPENCTRL, CMP_MLPI and MLPI_BASE_MODULES. For further information, see also the detailed description of the library TraceLib and the notes about Using the Trace for debugging.

The table shows the PLC data types within the IEC61131 environment 'IndraLogic' and the corresponding data types within the C/C++ environment (e.g. 'Workbench OEM') of the MLPI. On reading or writing variables by symbols or memory areas, on default, you use the functions below named after the MLPI data type like mlpiLogicWriteVariableBySymbolUshort. If you include the header mlpiLogicHelper.h, you can also use the equivalent functions named after the IEC61131 data types like mlpiLogicWriteVariableBySymbolWord or like mlpiLogicWriteVariableBySymbolUint.

Number of Bits	Data types of PLC	Data types of MLPI
8	BOOL	BOOL8
8	SINT	CHAR
16	INT	SHORT
32	DINT	LONG
64	LINT	LLONG
8	USINT	UCHAR
16	UINT	USHORT
32	UDINT	ULONG
64	ULINT	ULLONG
8	BYTE	UCHAR
16	WORD	USHORT
32	DWORD	ULONG
64	LWORD	ULLONG
32	REAL	FLOAT
64	LREAL	DOUBLE
8n	STRING	WCHAR16
16n	WSTRING	WCHAR16
16	TIME	ULONG
16	DATE	ULONG
16	DATE_AND_TIME	ULONG
16	TIME_OF_DAY	ULONG
8	Enumerator	SHORT