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Andrea F avatar image
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Andrea F asked Jeanette F commented

Token blocked in the process flow

Hi,

i am having problems troubleshooting my model. My process flow is a loop iterating through a global table that contains orders(rows) and type of product per order (column). The process flow iterates through columns and rows in order to find the cell value related to the order and the type of item that have to be retrieved. In the Outbound process there are different activities and they are related firstly to the picking, then the composition of the order by the operator , then the moving back of the pallet retrieved to the stack and finally the movement of the pallet to the sink. The problem in the model is the "Place pallet in the rack process " especially the load pallet. The token get stucked there without proceeding through the following steps. Is there an issue with the item to pick? how can i debug the problem properly ?

Thank you all

sarner-holz-final-floor-1-jv.fsm

FlexSim 19.1.2
warehouselogisticsstorageretrieval
sarner-holz-final-floor-1-jv.fsm (74.3 KiB)
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1 Answer

Jeanette F avatar image
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Jeanette F answered Jeanette F commented

Hello @Andrea F,

From examining the tree of the Transporter it became apparent that it was getting held up by empty task sequences. The nodes called activetasksequence and tasksequencequeue are the ones that helped debug this problem.

The empty task sequences was caused by your create task sequence in the first block of activities in the container labeled "Take Pallet From Rack" where the token was looping through to the No at the end of the block and creating the empty task sequences. I moved the create task sequence activity down a block of activities to remove the possible looping problem.

1625259406457.png

I also added a create task sequence and release resource in the "move the finished order" container.

sarner-holz-final-floor-1-JF_2.fsm


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sarner-holz-final-floor-1-jf-2.fsm (76.0 KiB)
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Andrea F avatar image Andrea F commented ·
Thank you Jeanette, i just have one problem i would not like that the token exit the zone until the loop is finished. The token when exit the zone loop back as expected but at the delay activity the already waiting token have the priority starting from the beginning with the nCol and nRow labels (from 1) making the loop faulty and not working. Do you know how can i give the priority to the token that is already in the loop in order to keep going with the incremental update of nCol and nRow labels until the sink is reached ?
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Jeanette F avatar image Jeanette F ♦♦ Andrea F commented ·
Hello @Andrea F,

I don't know exactly where to place the Enter Zone and Exit Zone activities because I don't fully understand your model. I think your problem would be solved by moving those activities.

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