Dynomotion

Group: DynoMotion Message: 11270 From: steve wayne Date: 3/27/2015
Subject: Using encoder input for indexing

Hi Tom,
I use opto inputs to sense index pulse (z pulse) of servo encoder for homing with index.
1- Can i use encoder inputs instead? So I can save the opto inputs for later use.
2- can I use encoder inputs as general purpose ports?
3- Why in SetFROwithPot.c example ADC result is subtracted by 2.5? Is it analog input offset voltage?
4- The spindle drive analog input accepts voltage in range of 0 - 2.8 volt. How can i limit analog output to 2.8 volt? What is the equivalent digit of this voltage in "step response->max limit->output"?

Regards
Steve

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Group: DynoMotion Message: 11271 From: Tom Kerekes Date: 3/27/2015
Subject: Re: Using encoder input for indexing
Hi Steve,

Regarding:

#1 & #2  yes - assuming you interface it properly electrically (not sure which encoder inputs you are referring to - differential? single ended?)
#3 changes value fro 0-5V reading to -2.5 to +2.5V
#4 2.8V x 2048dac counts/10.0V = 573 dac counts

HTH
Regards
TK

Group: DynoMotion Message: 11272 From: steve wayne Date: 3/27/2015
Subject: Re: Using encoder input for indexing

Thanks Tom,
About 1st and 2nd question, I use differential input for z signal. How should I do that?

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From:"Tom Kerekes tk@... [DynoMotion]" <DynoMotion@yahoogroups.com>
Date:Fri, Mar 27, 2015 at 11:48 PM
Subject:Re: [DynoMotion] Using encoder input for indexing

 

Hi Steve,

Regarding:

#1 & #2  yes - assuming you interface it properly electrically (not sure which encoder inputs you are referring to - differential? single ended?)
#3 changes value fro 0-5V reading to -2.5 to +2.5V
#4 2.8V x 2048dac counts/10.0V = 573 dac counts

HTH
Regards
TK

Group: DynoMotion Message: 11273 From: Tom Kerekes Date: 3/27/2015
Subject: Re: Using encoder input for indexing
Hi Steve,

I'm not sure I understand.  But if your encoder Z output has a differential driver it can be connected to any of the unused Kanalog differential inputs (A or B).

Regards
TK

From: "steve wayne steve.vip1980@... [DynoMotion]" <DynoMotion@yahoogroups.com>
To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
Sent: Friday, March 27, 2015 12:33 PM
Subject: Re: [DynoMotion] Using encoder input for indexing

 
Thanks Tom,
About 1st and 2nd question, I use differential input for z signal. How should I do that?
From:"Tom Kerekes tk@... [DynoMotion]" <DynoMotion@yahoogroups.com>
Date:Fri, Mar 27, 2015 at 11:48 PM
Subject:Re: [DynoMotion] Using encoder input for indexing

 
Hi Steve,

Regarding:

#1 #2  yes - assuming you interface it properly electrically (not sure which encoder inputs you are referring to - differential? single ended?)
#3 changes value fro 0-5V reading to -2.5 to +2.5V
#4 2.8V x 2048dac counts/10.0V = 573 dac counts

HTH
Regards
TK



Group: DynoMotion Message: 11274 From: steve wayne Date: 3/27/2015
Subject: Re: Using encoder input for indexing

Thanks Tom,
Ok, now imagine that in homing with index process the axis hits the limit switch and now seeking for z pulse to stop motor.
For example i write a c code to stay in a while loop untill it see the z pulse of encoder and z signal is connected to encoder differential input. The question is:

how should i check encoder differential input in c code for z signal and then stop the motor?

Regards
Steve

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From:"Tom Kerekes tk@... [DynoMotion]" <DynoMotion@yahoogroups.com>
Date:Sat, Mar 28, 2015 at 12:17 AM
Subject:Re: [DynoMotion] Using encoder input for indexing

 

Hi Steve,

I'm not sure I understand.  But if your encoder Z output has a differential driver it can be connected to any of the unused Kanalog differential inputs (A or B).

Regards
TK

From: "steve wayne steve.vip1980@... [DynoMotion]" <DynoMotion@yahoogroups.com>
To: "DynoMotion@yahoogroups.com" <DynoMotion@yahoogroups.com>
Sent: Friday, March 27, 2015 12:33 PM
Subject: Re: [DynoMotion] Using encoder input for indexing

 
Thanks Tom,
About 1st and 2nd question, I use differential input for z signal. How should I do that?
From:"Tom Kerekes tk@... [DynoMotion]" <DynoMotion@yahoogroups.com>
Date:Fri, Mar 27, 2015 at 11:48 PM
Subject:Re: [DynoMotion] Using encoder input for indexing

 
Hi Steve,

Regarding:

#1 #2  yes - assuming you interface it properly electrically (not sure which encoder inputs you are referring to - differential? single ended?)
#3 changes value fro 0-5V reading to -2.5 to +2.5V
#4 2.8V x 2048dac counts/10.0V = 573 dac counts

HTH
Regards
TK



Group: DynoMotion Message: 11276 From: Tom Kerekes Date: 3/27/2015
Subject: Re: Using encoder input for indexing
Hi Steve,

You would loop performing a ReadBit of the input bit your Index is wired to and then command a Jog to zero speed to stop.

There is s function already written to do all this that you can just call.  See the SimpleHomeIndexFunctionTest.c example which makes use of SimpleHomeIndexFunction.c

HTH
Regards
TK

Group: DynoMotion Message: 11280 From: steve wayne Date: 3/28/2015
Subject: Re: Using encoder input for indexing

Hi Tom,
Thanks for your kindly response.
I've already used that example you mentioned. In that example, z signal is connected to kanalog opto input and it works well.
I want to use kanalog differential encoder inputs instead of opto inputs. How can i access encoder input in c code in this case? Actually just z signal of servo encoder will be connected to kanalog encoder input and i don't know how to read kanalog encoder input like an opto input.

Regards
Steve

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From:"Tom Kerekes tk@... [DynoMotion]" <DynoMotion@yahoogroups.com>
Date:Sat, Mar 28, 2015 at 5:12 AM
Subject:Re: [DynoMotion] Using encoder input for indexing

 

Hi Steve,

You would loop performing a ReadBit of the input bit your Index is wired to and then command a Jog to zero speed to stop.

There is s function already written to do all this that you can just call.  See the SimpleHomeIndexFunctionTest.c example which makes use of SimpleHomeIndexFunction.c

HTH
Regards
TK

Group: DynoMotion Message: 11281 From: Tom Kerekes Date: 3/28/2015
Subject: Re: Using encoder input for indexing
Hi Steve,

Oh sorry.  Encoder Input Bits are just like all Input Bits they are just different numbers.  The Kanalog Differential Receivers just convert the signals to single ended and pass through to KFLOP's Single Encoder Inputs.   

Kanalog JP1 goes to KFLOP Encoders 0-3 and are on KFLOP Inputs 0-7.
Kanalog JP2 goes to KFLOP Encoders 4-7 are are on KFLOP Inputs 36-42

HTH
Regards
TK