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Ankur A3 avatar image
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Ankur A3 asked Jordan Johnson commented

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!

FlexSim 23.1.3
breakdown trigger
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Jason Lightfoot avatar image Jason Lightfoot ♦♦ commented ·

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Jordan Johnson answered Jordan Johnson commented

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 avatar image Ankur A3 commented ·
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 avatar image Jordan Johnson ♦♦ Ankur A3 commented ·
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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