Downtime & uptime occurring same time?

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Ankur A3 asked Nov 03 2023 at 2:38 PM Jordan Johnson commented Nov 09 2023 at 4:51 PM

Downtime & uptime occurring same time?

Hi Team,

I am applying the downtime and uptime to my equipment using variable distribution Weibull (for up time) and lognormal (for downtime). But I have observed few instances where downtime and uptime are trigged at the exact same time which is not possible in reality.

How this is possible?

Thank you!

Software Version:

FlexSim 23.1.3

breakdown trigger

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Answer 1 · 2023-11-03T15:24:34Z

Jordan Johnson answered Nov 03 2023 at 3:24 PM Jordan Johnson commented Nov 09 2023 at 4:51 PM

If either the uptime or downtime expression can produce a value of zero or less, then the down/uptime would occur at the same time. If an event is scheduled in the past (such as bringing an item down 2 seconds ago) then it just happens at the current time and a message appears in the system console. For this message, the system console does not open automatically. If you open the system console and run your model, watch for any messages that mention an "event time in the past".

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Ankur A3 commented · Nov 09 2023 at 8:06 AM

Hi @Jordan Johnson,

To have quick workaround to avoid 0 time, I am using Math.max(0.1, distribution) currently.

Would you like to suggest anything else?

Thank you!

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Jordan Johnson ♦♦ Ankur A3 commented · Nov 09 2023 at 4:51 PM

That is a good workaround. The other option is to reconsider your choice of distribution. If you are using a distribution for a time and the distribution allows negative values, then there is a high likelihood that the distribution isn't a fair representation of the process.

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