Count and Time Program: How many parts per minute are going past a certain proce
ID: 1766039 • Letter: C
Question
Count and Time Program: How many parts per minute are going past a certain process point? The counter is pulsed for each part going past the sensor, which is connected to Input 1. The counting begins and the timer starts timing through its 60 second time interval. At the end of 60 seconds, pulses continue but do not affect the counter. The part count for the minute will remain in the counter register until switch S is opened. Then the counter and timer are reset. When S is closed again, another 60 second interval occurs with another part count saved at the end of the 60 second period. How would you make the process continuous with the last 60 second part count the one read? How would you make the process show the average of the last 10 minutes’ part-count, the last hour?
Explanation / Answer
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In the first case, the pulses continue to be generated, however the counting stops as soon as a count of 60 secs is reached. Its only when switch S is made to be open that the counter is reset. For continous operation, we have to just reset the counter everytime the count reaches 60. However, in order to retain the output of the counts, we have to connect this counter to another counter that counts one up every 60 secs. Thus, the first counter counts 1-60 then resets, the second counter counts up when the first counter resets and so on...
To show the average of the 10 minutes part count, a third counter is utilised which counts from 1 till 600 (10 mins). Once a count of 600 is reached, the output from the second counter is taken and divided by 10 to get the 10 mins average. For one hour average, the third counter has to count till 3600 (1 hour)