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
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