Ass include of iec_std_lib.h in POUS.h file.
#ifndef IEC_TYPES_H
#define IEC_TYPES_H
#include <limits.h>
#include <float.h>
#include <stdint.h>
/*********************/
/* IEC Types defs */
/*********************/
typedef uint8_t IEC_BOOL;
typedef int8_t IEC_SINT;
typedef int16_t IEC_INT;
typedef int32_t IEC_DINT;
typedef int64_t IEC_LINT;
typedef uint8_t IEC_USINT;
typedef uint16_t IEC_UINT;
typedef uint32_t IEC_UDINT;
typedef uint64_t IEC_ULINT;
typedef uint8_t IEC_BYTE;
typedef uint16_t IEC_WORD;
typedef uint32_t IEC_DWORD;
typedef uint64_t IEC_LWORD;
typedef float IEC_REAL;
typedef double IEC_LREAL;
/* WARNING: When editing the definition of IEC_TIMESPEC, take note that
* if the order of the two elements 'tv_sec' and 'tv_nsec' is changed, then the macros
* __time_to_timespec() and __tod_to_timespec() will need to be changed accordingly.
* (these macros may be found in iec_std_lib.h)
*/
typedef struct {
long int tv_sec; /* Seconds. */
long int tv_nsec; /* Nanoseconds. */
} /* __attribute__((packed)) */ IEC_TIMESPEC; /* packed is gcc specific! */
typedef IEC_TIMESPEC IEC_TIME;
typedef IEC_TIMESPEC IEC_DATE;
typedef IEC_TIMESPEC IEC_DT;
typedef IEC_TIMESPEC IEC_TOD;
#ifndef STR_MAX_LEN
#define STR_MAX_LEN 126
#endif
#ifndef STR_LEN_TYPE
#define STR_LEN_TYPE int8_t
#endif
#define __INIT_REAL 0
#define __INIT_LREAL 0
#define __INIT_SINT 0
#define __INIT_INT 0
#define __INIT_DINT 0
#define __INIT_LINT 0
#define __INIT_USINT 0
#define __INIT_UINT 0
#define __INIT_UDINT 0
#define __INIT_ULINT 0
#define __INIT_TIME (TIME){0,0}
#define __INIT_BOOL 0
#define __INIT_BYTE 0
#define __INIT_WORD 0
#define __INIT_DWORD 0
#define __INIT_LWORD 0
#define __INIT_STRING (STRING){0,""}
//#define __INIT_WSTRING
#define __INIT_DATE (DATE){0,0}
#define __INIT_TOD (TOD){0,0}
#define __INIT_DT (DT){0,0}
typedef STR_LEN_TYPE __strlen_t;
typedef struct {
__strlen_t len;
uint8_t body[STR_MAX_LEN];
} /* __attribute__((packed)) */ IEC_STRING; /* packed is gcc specific! */
#endif /*IEC_TYPES_H*/