adccommunitymod (AutomationDirect) asked a question.
Counting Frequency Output Pulses For Batching
Created Date: June 16,2016
Created By: ydp
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I am interesting in using a DC input module to count pules out of drives (mostly Dura-pulse, some Vacon) for batching. I do this now with stand alone counters, but want to integrate everything into our plc. I see the input modules can handle the response of about a 70 hz pulse train, but have never tried this. Anyone out there have any experience with this??
Created Date: June 16,2016
Created by: ydp
I am interesting in using a DC input module to count pules out of drives (mostly Dura-pulse, some Vacon) for batching. I do this now with stand alone counters, but want to integrate everything into our plc. I see the input modules can handle the response of about a 70 hz pulse train, but have never tried this. Anyone out there have any experience with this??
Created Date: June 16,2016
Created by: plcnut
Which PLC, CPU, and input card are you using? How fast is the fastest pulse you need to catch?
Created Date: June 16,2016
Created by: ydp
Terminator T1K-16ND3, 100-120 Hz for the fastest....looks like module will handle from 125 to 500 Hz.......so I don't see an issue there....have you tried this? I may just go down and do a test, but was hoping to hear from someone that had experience first....
Created Date: June 16,2016
Created by: plcnut
It looks like you will really be pushing the limits for that module. You can try it and see if it will work though. Is it connected to a Do-More? What are your current scan times?
Created Date: June 16,2016
Created by: ydp
It will be a Do-More master, EBC100 slave, right now it is all just on paper. I have another do-more running nearby where I can grab some pulse trains from drives and test....guess I will go do that. I will try to post my results later....thanks.
Created Date: June 16,2016
Created by: ydp
Well, I was able to hook up to a D2-08ND3 input module (Do-More CPU), which has specs really close the Terminator T1K-16ND3 module I want to use. At about 150 Hz on the pulse train, the input card stops being able to count. This is 6.6 ms, which is right in this modules ' response time of 2 - 8 ms. I can make this work for my application. And maybe this info will help the next person.......
Created Date: June 16,2016
Created by: plcnut
Cool. Thank you for following up!
Created Date: June 16,2016
Created by: ydp
You are welcome......I need 6 coounter channels. otherwise I would use a CTRIO module, but I think you cannot get 6 channels on one CTRIO module?? Is that correct? I only tried to configure one of those once, a while back and that seemed to be the case. They claim 8 input channels, but I seem to remember that they could not all be set up as just counters.???
Created Date: June 16,2016
Created by: plcnut
The CTRIO supports 4 single channel high speed counter inputs max.
Created Date: June 17,2016
Created by: some anon guy
Well, I was able to hook up to a D2-08ND3 input module (Do-More CPU), which has specs really close the Terminator T1K-16ND3 module I want to use. At about 150 Hz on the pulse train, the input card stops being able to count. This is 6.6 ms, which is right in this modules ' response time of 2 - 8 ms. I can make this work for my application. And maybe this info will help the next person.......
I would think that the card will only be able to count as fast as your scan time for the ladder code. The card can do 2 to 8 ms, but if you have a 20ms scan time I believe you will start missing counts...