ROTATION_DIFFERENCE (FB)¶

FUNCTION_BLOCK ROTATION_DIFFERENCE

Computes the difference between two UINT values without rollover

This function block receives two values e.g. from an motion encoder and calculates the difference between the two positions.

If curValue := 65535 and lastValue := 15, a negative rotation is detected and diffValues := -16.

If lastValue := 65535 and curValue := 15, a positive rotation is detected and diffValues := 16.

InOut:

Scope	Name	Type	Comment
Input	`curValue`	`UINT`	Current value of rotation
Input	`lastValue`	`UINT`	Last value of rotation
Output	`diffValues`	`INT`	Difference between the two values without rollover