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• IEC 61131-3 Functions and Function Blocks
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• EXPT

EXPT

Type	Function
Description	Calculates the exponentiation of the base connected to IN1 and the exponent connected to IN2. Note This function is not extendable, no further inputs can be added.
Parameters	Inputs IN1 Data type: ANY_REAL Description: Base IN2 Data type: ANY_NUM Description: Exponent Output OUT Data type: ANY_REAL Description: Output value
Error behavior	Error behavior The following table shows the errors which may occur while executing the function and the value returned by the function in the corresponding error case. Error case Output value Result > REAL_MAX or LREAL_MAX Inf+ IN1 or IN2 = NaN NaN IN1 = 1 and IN2 = NaN 1 IN1 not NaN and IN2 = 0 1 IN1 = Inf- and IN2 < 0 0 IN1 = Inf- and IN2 = positive odd integer Inf- IN1 = Inf- and IN2 = positive but not odd integer Inf+ IN1 < 0 but not Inf- and IN2 not an integer, Inf+, or Inf- NaN IN1 = -1 and IN2 = Inf+ or Inf- 1 -1 < IN1 < 1 and IN2 = Inf- Inf+ -1 < IN1 < 1 and IN2 = Inf+ 0 IN1 < -1 or IN1 > 1 and IN2 = Inf- 0 IN1 < -1 or IN1 > 1 and IN2 = Inf+ Inf+ IN1 = 0 and IN2 < 0 Inf+ IN1 = 0 and IN2 > 0 0 IN1 = 1 and IN2 not NaN 1 IN1 = Inf+ and IN2 < 0 0 IN1 = Inf+ and IN2 > 0 Inf+
Additional information	EN/ENO behavior The POU is only executed if TRUE is applied to the EN input. If EN = FALSE, the POU is not executed and ENO = FALSE indicates the inactivity. If any of the errors listed under "Error behavior" occurs while executing the function, ENO is set to FALSE. Note ENO stays TRUE for a result that is not a real number (NaN) or a positive infinity (Inf+) or a negative infinity (Inf-) value. Further Info See the topic "General information on execution control with EN/ENO" for further details.