Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 500)

L-force | PLC Designer
IEC Operators and additional norm extending functions
498 DMS 3.2 EN 02/2011 TD29
9.10.4 LOG
PLC Designer IEC operator: Returns the logarithm of a number in base 10. IN can be
type BYTE, WORD, DWORD, INT, DINT, REAL, SINT, USINT, UINT, UDINT, OUT must be
type REAL.
Example in IL:
LD 314.5
LOG
ST q (* Result is 2.49762 *)
Example in ST:
q:=LOG(314.5);
Example in FBD:
9.10.5 EXP
PLC Designer IEC operator: Returns the exponential function. IN can be type BYTE,
WORD, DWORD, INT, DINT, REAL, SINT, USINT, UINT, UDINT, OUT must be type REAL.
Example in IL:
LD 2
EXP
ST q (* Result is 7.389056099 *)
Example in ST:
q:=EXP(2);
Example in FBD: