Panel PP877 - Memory usage
I have ABB Panel PP877. I programmed 9 Data Logs that are shown on two trends.
I set that over 1 month, every 10 seconds log is update. Therefore we get 259,200 logs per variable.
When we multiply that with 9 logs we get 2,332,800 logs in 1 month.
I would like to know how much memory will that amount of logs use.
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From PanelBuilder Manual:
Calculation of Trend Size
It is possible to calculate how much space trend data will take up in the project memory with the following equation.
S = TOS + AK (2 + (AS + 1) * 8)
TOS = TrendObjectSize; if all parameters for a trend object are changed, TOS = 320 bytes.
AK = Number of defined curves in the trend object.
AS = Number of Samples rounded-off to the nearest hundred.
S = Number of bytes
In your case 320+9(2+(2332800+1)*8)=167,962,010 bytes = 160,1 MB
I think that is too much.
Max allowed number of samples (sample count) per trend is 65,534 = est. 7,5 days with sampling at every 10 sec