How to read encoder phases in FPGA whith a 9516 and Crio

[SimonBDP]

Hello,
I have the following equipment:
- a CRIO 9033
- a NI9516

I'm using the FPGA interface and the "FPGA Servointerface (9516).vi" from the exemple.
How to read the 4 phases of my encoders (A, A /, B, B /) directly in the FPGA ?

[SebastienF]

Hello,

Can you explain to me what is (A, A /, B, B /) ?

You need to know the velocity, the position of the encoder ?

Regards,

Kardio

[SimonBDP]

Hello,

This is the 4 outputs of my incremental encoder.
I don't need to know the velocity or the position of the encoder, i need to count the edges.

Note : I am already able to do this task with a NI 9401. But now, i want to do this with my encoder wired only on my NI 9516.

Thank you for your time.

[SebastienF]

Hello,

I'm searching if there is a function to read the edges but I can't find it.

I don't have your hardware to try myself. Maybe you could detect the edges by doing yourself the functionality. A function which detects status changes of your Digitals Inputs (See "Digital Input 0 Changed ?" in the picture link below) and doing a counter.

You can write in LabVIEW exemples "Edge Counter"  and a old post (http://forums.ni.com/t5/Motion-Control-and-Motor-Drives/Read-simultaneously-NI-9516-both-Encoders/m-...) which can maybe help you.

[SimonBDP]

Thank you,

I do not think that is possible. I will have to keep my current hardware configuration.