Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 503)

L-force | PLC Designer
IEC Operators and additional norm extending functions

DMS 3.2 EN 02/2011 TD29 501
9.10.10 ACOS
»PLC Designer« IEC operator: Returns the arc cosine (inverse function of cosine) of a
number. The value is calculated in arch minutes. IN can be type BYTE, WORD, DWORD,
INT, DINT, REAL, SINT, USINT, UINT, UDINT, OUT must be type REAL.
Example in IL:
LD 0.5
ACOS
ST q (* Result is 1.0472 *)
Example in ST:
q:=ACOS(0.5);
Example in FBD:
9.10.11 ATAN
PLC Designer IEC operator: Returns the arc tangent (inverse function of tangent) of a
number. IN can be type BYTE, WORD, DWORD, INT, DINT, REAL, SINT, USINT, UINT,
UDINT. The result OUT is calculated in arch minutes and must be type REAL.
Example in IL:
LD 0.5
ATAN
ST q (* Result is 0.463648 *)
Example in ST:
q:=ATAN(0.5);
Example in FBD: