HEIDENHAIN TNC 426 (280 476) - Manual (Page 411)

384 10 Programming: Q Parameters
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Rules for formulas
Mathematical formulas are programmed according to the following
rules:
Higher-level operations are performed first (multiplication and
division before addition and subtraction)
1st step 5 * 3 = 15
2nd step 2 * 10 = 20
3rd step 15 + 20 = 35
Arc tangent
Inverse of the tangent. Determine the angle from the
ratio of the opposite to the adjacent side.
Example: Q12 = ATAN Q50
Powers of values
Example: Q15 = 3^3
Constant “pi” (3.14159)
Example: Q15 = PI
Natural logarithm (LN) of a number
Base 2.7183
Example: Q15 = LN Q11
Logarithm of a number, base 10
Example: Q33 = LOG Q22
Exponential function, 2.7183 to the power of n
Example: Q1 = EXP Q12
Negate (multiplication by -1)
Example: Q2 = NEG Q1
Truncate decimal places
(form an integer)
Example: Q3 = INT Q42
Absolute value of a number
Example: Q4 = ABS Q22
Truncate places before the decimal point
(form a fraction)
Example: Q5 = FRAC Q23
Mathematical function Soft key
12 Q1 = 5 * 3 + 2 * 10 = 35