NORD Drivesystems BU0550 - Manual (Page 30)

PLC logic for NORD SK 54xE frequency inverters
30 BU 0550 GB-0813
3.2.3.3 LN
Logarithm to base e (2.718). Up to 3 places behind the decimal point may be stated, i.e. 1.000 must be
entered as 1000.
1000
1000
ln
 





 Akku
Akku
BOOL BYTE INT DINT
Possible data types X
Commands Explanation
LD 1234
LN Result = 210
ST Var1 Save the value 210 in Value1
Table 24 LN
3.2.3.4 SQRT
Forms the square root of the accumulator. Up to 3 places behind the decimal point may be stated, i.e. 1.000
must be entered as 1000.
1000
1000
 





 Akku
Akku
BOOL BYTE INT DINT
Possible data types X
Commands Explanation
LD 1234
SQRT Result = 1110
ST Var1 Save the value 1110 in Var1
Table 25 SQR
3.2.3.5 COS, ACOS, SIN, ASIN, TAN, ATAN
Calculates the relevant mathematical function. The value to be calculated must be available in the
accumulator in radians. The scaling corresponds to 1 = 1000.
Conversion: Angle in radians = (Angle in degrees * PI / 180)*1000
e.g. an angle of 90° is converted as follows  90° * 3.14 / 180) *1000 = 1571
1000
1000
sin
 





 Akku
Akku 1000
1000
cos
 





 Akku
Akku 1000
1000
tan
 





 Akku
Akku
1000
1000
sin
 





 Akku
a Akku 1000
1000
cos
 





 Akku
a Akku 1000
1000
tan
 





 Akku
a Akku
BOOL BYTE INT DINT
Possible data types X
Commands Explanation
LD 1234
SIN
ST Var1 Save the value 943 in Var1
Table 26 Trigonometrical functions