Encoder displacement VI Help

Howdy Everyone,
I am currently working on a project that requires me to get the displacement of an incremental encoder with 2 channels A and B. I already have the counts for A but I still did not find any VI that calculates displacement. I am currently using a Wireless Data Aquistion System "WLS-9163" with NI-9215 module.
Any help would be really appreciated.
Thanks.
Mechanical Engineer

Thanks for replying. I am currently using the following code to measure A channel counts. I already tried and it is working properly for counting up and down.
Mechanical Engineer
Attachments:
2.jpg ‏98 KB

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