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Messages - cch1955

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196
Technical support / Ladder counters
« on: July 26, 2006, 04:37:00 PM »
In my application I need to use the ladder logic counters (2) for length measurment taken by sensor wheel running on product. Frequency worst case is 70ms (14hz). I know scan time is dependant on many factors. I am concerned that my frequency may be too high and I will miss counts making length wrong. I am assuming state change for counter input from one scan to the next increments the counter.

Do you have an "guideline" of maximum frequency for the ladder counters based on bare minimum PLC program?

If I had this I could rough out what I may be able to count on with lines of code etc.

Thanks
Chris

197
Technical support / Re:HS counters and quadrature encoders
« on: July 25, 2006, 09:43:32 AM »
So I understand 100 counts in HSC for 100 lines of encoder disk.

A&B not additive to give 200 counts per revolution. No multiplier like 4X to give 400 counts per revolution with 100 line encoder as in some interface.

I will test when have encoder interface.

Thank you for clarification
Chris
 :)

198
Technical support / HS counters and quadrature encoders
« on: July 24, 2006, 02:32:34 PM »
I am working on a small project that uses T100MD with two encoders. If I am using the HS counters 3&4 , 5&6,  I am unclear on decoding multiplier to the HS count register. To be clear: If I have 100 line encoder, will it change the counter by 100 per revolution or 400 per revolution? I am only running at 550 rpm so speed should be fine.

Thanks
Chris

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