Logging "Downtime" in RSLogix 5000

[HunterM93]

Hello,

I've been browsing the forum and doing internet searches but i haven't been able to make anything work. What i am trying to do is log how long the downtime on some of my production lines. What i am trying to do is setup to log the duration of the last 10 stops. I have the logic setup to count the downtime but i am having issues putting it into an array for storage. Once the array is full i want to push out the oldest data so that it can keep loading new information.

Once i have the above mentioned setup i plan on displaying it on an HMI for operators.

 

[kellian]

Look at FIFO intruction

 

[Ken Moore]

You could "roll your own". You have a data Array, 10 elements. Store the current downtime in Array[0], when you need to store another, use a ONS to Copy Array[0] to Array[1], length of 9, then write your data to [0] again.

 

[widelto]

Hunter:
This is what i did years ago:
1) Define what down time is , i.e. how many minutes without production. For instance if the line has been off for more than 3 minutes then that configures a downtime.
2) Define what production is on again,i.e. , how many minutes products are been produced. For instance if production has been on for more than 3 minutes then line is ok
2) Use a timer to log downtimes less than 2 minutes this has to be a RTO timer, one for shift, one for day.
3) you can try to log the reason for down time along with time , if the line is on again and the operator did not enter reason for last down timw the line will stop again.
4) use a FIFO in my case i designed a UDT that contain start time final time and reason for downtime.

Hope this will help.

 

[HunterM93]

Does anyone have any pointers on using a FIFO instruction? Ive looked at it but ive never used one before and ive not seen one used in any of our 50+ running programs.

 

[Geoff White]

Its probably easier to do what ken says and just stick the value into the last element of an array and copy len-1 elements from element 1 to element 0.

With a fifo you will need to use both a fifo load and unload command each time to update the array.

When new data comes in:
- if fifo is full then use ffu to remove first entry
- push new data in with ffl command

Both instructions use the same control structure