amitkumar Posted January 15, 2015 Posted January 15, 2015 At present we are using Brick controller with DAC of 18 bit resolution. But our vendor is unable to provide the same at the same price and has offered Brick controller with DAC of 16 bit resolution. Should i go for the second one in place of first one or should I go for the first one investing more money ? How much comprise I might be making if I would buy the 16 bit DAC ?
amitkumar Posted January 15, 2015 Author Posted January 15, 2015 At present we are using Brick controller with DAC of 18 bit resolution. But our vendor is unable to provide the same at the same price and has offered Brick controller with DAC of 16 bit resolution. Should i go for the second one in place of first one or should I go for the first one investing more money ? How much comprise I might be making if I would buy the 16 bit DAC ?
steve.milici Posted January 15, 2015 Posted January 15, 2015 I would only expect very hi resolution systems (sub-nanometer) to be affected by using the 16-bit DAC instead of the 18-bit.
steve.milici Posted January 15, 2015 Posted January 15, 2015 I would only expect very hi resolution systems (sub-nanometer) to be affected by using the 16-bit DAC instead of the 18-bit.
amitkumar Posted January 16, 2015 Author Posted January 16, 2015 I would only expect very hi resolution systems (sub-nanometer) to be affected by using the 16-bit DAC instead of the 18-bit. The Pmac in my system is used to run drives in analog torque mode. Also it has a position loop superceeding it such that the position error is fed to pmac analog input with the pmac housing the speed loop. Is there a way to nullify the affect of decrease in resolution ?
steve.milici Posted January 16, 2015 Posted January 16, 2015 In this case the noise levels of the analog input would far outweigh the "loss" of resolution in the DACs. I would not think that your application would suffer from using the 16-bit DACs.
amitkumar Posted January 19, 2015 Author Posted January 19, 2015 In this case the noise levels of the analog input would far outweigh the "loss" of resolution in the DACs. I would not think that your application would suffer from using the 16-bit DACs. Thanks for your reply.Would I need to make any changes in i169 or the code within PMAC due to the DAC change ? Would you suggest that we put the 16 bit DAC PMAC in our application before we finalize it ?
steve.milici Posted January 20, 2015 Posted January 20, 2015 No - you will leave everything as is; it is transparent to the user. It is always a good thing to try it first on a test system if you're not sure about the application "resolutions" but from what you have described I do not see an issue.
amitkumar Posted January 29, 2015 Author Posted January 29, 2015 No - you will leave everything as is; it is transparent to the user. It is always a good thing to try it first on a test system if you're not sure about the application "resolutions" but from what you have described I do not see an issue. Thanky you
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