09-15-2019 01:04 AM
Hello,
I am trying measure angular displacement from Burster 8661. I have 9172 chasis with 9411 module. I am using slot 5 of 9172 chasis for 9411.
My wire like below
pinG to PFI.0
pinB to PFI.1
pinD to COM
I am using angular displacement example in labview and selecting counter0.
Is there connection true or not? Because I am measuring wrong data from 9411.
You may find torque sensor datasheet in attachment.
Thanks.
09-16-2019 04:00 PM
Hi YFA,
I would check the getting started guide in the link below to make sure you are making the right connections:
NI 9411 Getting Started Guide - National Instruments
http://www.ni.com/pdf/manuals/373506f.pdf
The articles below may also help as well:
Using Differential Quadrature Encoders with the NI-9411
https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019ZSCSA2&l=en-US
How Do I Wire an Encoder to the NI 9411 Module?
https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P9BYSA0&l=en-US
09-17-2019 01:43 PM
Hello JiwhanS,
Firstly many thanks for your valuable message.
Is burster 8661's encoder differential or single ended?
I can not celar understand the connections. Could you please check the attachments?
Burster has two pins G&B for each TTL signal and I connected this pins to 9411 (pin-1 and pin-3).
I did not figure out that,
How can I connect 2 pins system (burster) to 6 pins system (9411)
As showed your link the 9411 connected to A- / B- / Index + / Index - pins.
But I dont know which pins are A- / B- and Index +/- on burster.
Could you please match the pins?
Fatih.
09-20-2019 03:40 AM
Hello,
I talked with the 8661 manufacturer and they informed me about 9411 connection. The right connection is same which I send first message. I am trying to measure phase displacement via attached vi (in up message) but my measurement datas are not sensible. Could any one help me please.
Thanks.
09-20-2019 01:22 PM
What data are you receiving, and what do you expect? Your VI looks good from a 2-second glance.
09-20-2019 02:49 PM - edited 09-20-2019 02:50 PM
You did not set up our a and b channels. Look at the example below.
09-21-2019 12:39 PM
Hello,
Actually my channel definition seems right. 8661 has not got - pins and Zindex.
Pulses per rev value is 1024 and decoding type X4.
So I need help calculation angular value from measurement value.
Thanks.
09-23-2019 07:31 AM
Look at the difference between your code and the code that I provided. I am telling you that you did not set up your data acquisition correctly. If you set it up the way that I showed you will get and angle out as a result. No extra calculation to do. The pins are the inputs to your DAQ card not the 8661.
09-23-2019 10:37 AM
aeastet is right, your terminals are probably wired wrong. See this article:
http://zone.ni.com/reference/en-XX/help/370466AH-01/mxdevconsid/cdaqphychannels/
C series counter modules have ctr0 defaulting to PFI0 and PFI4 for A and B. Set these explicitly in your code. Also, your code has a Pulses per Revolution of 24, so you need to set this to the right value.
Again, if you're getting bad data back already, please post what data you're getting and what data you expect to be getting, and we can help more from there.
09-28-2019 11:05 AM
Hello Bert,
As you will see in attachment, I connected the A and B wires to PFI0 and PFI4 but, it is still measuring wrong data.
Also the daq assistant present PFI0 and PFI2 in configuration panel. You may see it from cntr2.png in attachment.
I tried both connection ways but it still not working properly.
Best,