Connections of encoder with cDAQ 9401

I hope that some of the experts here can help me with this as I am new to encoders. I want to make sure I connect this right but am finding conflicting information on this subject. I found this tutorialwhich shed some light on some things for me.  If I interpret it correctly, 9401 card that I use (with 9172 chassis) can provide 5 VDC needed excitement for the encoder on any unused line. However, I have seen a response to an applications engineer OR which suggests an external power supply is necessary to this thread.

So my first question is if I need an external power supply.

Secondly, I have an encoder with 8 sons and am a bit uncertain to know if I need to connect each of them for my angular position measurement, I don't see any reference to A', B ', Z' in the documentation I found. Here is the datasheet for the encoder I use, in line driver configuration (I think it's x 2).

I have also attached a picture of the stitching and the configuration of the meter for this encoder for someone who won't get the full data sheet.

Thank you in advance to anyone who can help!

Hi Johnny,.

In this case, as we have said before, this module won't be able to excite your encoder properly using digital lines. It will not be able to provide the full 5V on a given channel output. Also, since the input for your encoder voltage is 4.75V minimum, you will need an external power supply. Who will provide the adequate power to drive this encoder. As long as you can excite the encoder properly, this module should be good to read the signals and interpret them for angular position measurement.

Chris

Tags: NI Hardware

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