What do I need to connect a quadrature encoder to a M series card

[Toro]

I need to add a quadrature encoder to keep track of position of our product. I have not found good clear information on it. I have a PCIe-6259 with a SC-2345 series SCC Module carrier,  I am using LabView 8.5

[mallorim]

Hi Toro,

The SC-2345 Carrier has a 42-position, triple-row screw-terminal block that you can use to connect digital signals to your M Series DAQ card. The pinouts for this terminal block can be seen on page 28 in Figure 2-1 of the SC-2345 Carrier User Manual.

With regards to which pin to connect to, any of the PFI lines can be used to connect the A, B, and Z lines of your quadrature encoder to your NI PCI-6259.  However, when you configure a Counter Input >> Angular Encoder DAQmx Task, there are three lines used by default for these connections, as described in the following Knowledge Base Document 3DG87CPS: Default M-Series PFI Lines for Angular Encoder Measurements

You can change which PFI lines are used by selecting the PFI lines for the A, B, and Z lines with a DAQmx Channel Property Node.  This process is outlined in the following Knowledge Base 3DGAJHPS: Selecting PFI Lines Used for Quadrature Encoder Measurements in LabVIEW.  

Hope this helps, Mallori M.

[dpak27]

Hi,

I am trying to connect a quadrature encoder (just A and B channels) to  SC-2345 connected to a PCIE-6036E.  I am trying to follow your example and I do not find the "position" option in the DAQmx. Please tell me what I am missing.  Can you  please post a simple vi to count Up and Down.

Thanks,

DS

[dpak27]

Found the example CountDigitalEvents.vi in LV7.1 and seems to work by connecting A to 37 and B to 16 in sc-2345. - DS

[Toro · Accepted solution]

You are in the right track. Take a look at the knowlegeBase file 3DGAJHPS or do a search for that file.

I use counter zero  A+ to PFI8 Pin 37 and B+ PFI10 Pin 45  and you are using the Z+ PF19 of the terminal blocks. Here is ia sample VI .