Issue
EcoStruxure Control Expert doesn't provide Double length real calculation functions.
Resolution
This library performs Long real calculation using an array type LREAL of 2 Dword, where the long real is coded using IEEE 754 format.
The zip file attached contains the library, a FBD section to test the library and a tool allowing to convert the IEEE 754 format (useful to make the test)
Be aware that all the controls are not performed when overflow happens, so use the library with care, mainly when you perform type conversions.
Function list
Math functions
ADD_DREAL
SUB_DREAL
MUL_DREAL
DIV_DREAL
ABS_DREAL
NEG_DREAL
POW_DREAL
SQRT_DREAL
EXP_DREAL
LN_DREAL
LOG_DREAL
Trigononmetric Functions
ACOS_DREAL
ASIN_DREAL
ATAN_DREAL
COS_DREAL
SIN_DREAL
TAN_DREAL
Logic Functions
EQ_DREAL
GE_DREAL
GT_DREAL
LE_DREAL
LT_DREAL
Convertion Functions
INT_TO_DREAL
DINT_TO_DREAL
DREAL_TO_DINT
DREAL_TO_INT
DREAL_TO_REAL
DREAL_TO_STRING
REAL_TO_DREAL
Disclaimer
The views and opinions expressed in this article are those of the author(s) and do not necessarily reflect the official policy or position of Schneider Electric.
This library is given as if. Use of the library is the responsibility of the user
