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  • 1.  Cplex scheduling problem

    Posted 11/20/23 12:55 PM
    Hello

    If I need to schedule several production orders and their sizes are larger than 3 days. But my work center capacity is 20 hours per day. Can cplex pause the POs automatically when capacity is reached and continue the PO on a different day ? If yes, what function ? If not, there will be no feasible solution. and will the sizes have to be adjusted manually ?

    Thanks
    Quan

    Sent from my iPhone


  • 2.  RE: Cplex scheduling problem

    Posted 11/21/23 02:49 AM

    Hello,

    You should look at intensity functions when defining the intervals associated with these long tasks.
    https://www.ibm.com/docs/en/icos/22.1.1?topic=c-interval-variables-in-cp-optimizer
    Essentially, CP Optimizer allows tasks to be suspended at certain times.  You should make intensity
    0 when the work center is closed.  Also, these constraints below might be useful depending on what
    you want to do.
    https://www.ibm.com/docs/en/icos/22.1.1?topic=functions-forbidextent
    https://www.ibm.com/docs/en/icos/22.1.1?topic=functions-forbidstart
    https://www.ibm.com/docs/en/icos/22.1.1?topic=functions-forbidend

    Best regards,


    Paul



    ------------------------------
    Paul Shaw
    ------------------------------



  • 3.  RE: Cplex scheduling problem

    Posted 11/29/23 04:48 PM
    Thanks! I am trying to implement a calendar using the house building example in the cplex manual. To define a step function I need to define breaks. In my case, breaks is defined for each operator. So it should be an array of arrays of tuples of two integers. But the software keeps giving me error: Data array unexpected for "Breaks". 
    I wrote Breaks = { {<int, int>, <int,int>, ...}, {<int,int>,...},...} 

    Anything wrong ?



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