DERIVATIVE (FB)¶

FUNCTION_BLOCK DERIVATIVE

Approximates the derivative of a given value in its time course

Four consecutive values are recorded and used in the calculation so that the resulting derivative is as accurate as possible.

Example: Function block in FBD

InOut:

Scope	Name	Type	Comment
Input	IN	REAL	Input value
	TM	DWORD	Time since last call in msec
	RESET	BOOL	TRUE: OUT is set to zero and saved values are set to the current input IN
Output	OUT	REAL	Derivative