Triggers not working

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shanice.c asked Sep 16, '21 shanice.c commented Sep 17, '21

Triggers not working

I have my resource(queue or processor) available summary in a globaltable(TableCheckAvailableResource).

When a task is created, the number of resource available in table minus one, whenever product exit the resource the number +1 by setting in triggers.

I'm using the same way in a process flow from AGV's point of view(the process flow named "Object"), AGV will look for task to execute. Now I'd like to let product create new task, and dispatch the task to AGV. AGV reads the task information from a table(the process flow named "Object2_AGV process flow" and "Product_ProcessFlow").

I cannot find the reason why resource available summary in a globaltable only decrease by using these 2 flows, when product exits, the number never increase again. I think this cause product not able to find it's destination.

0916.fsm

Software Version:

FlexSim 21.2.0

global table triggers

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Answer 1 · 2021-09-16T07:39:22Z

Felix Möhlmann answered Sep 16, '21 shanice.c commented Sep 17, '21

The triggers work correctly. If you set a break point in the code and step through it you will see the cell value correctly increase. However, the "Process Finish" event also causes the corresponding token in the "Product_ProcessFlow" to move on and re-enter the "Code: Determine TaskType" activity. There the value is decremented again. As this happens at the same model time, the table won't get updated between these when you run the model normally.

Aside from that I get an error at 327s, because you don't cover the case that the query in some of the "Assign [Transporter, FromStation, ToStation] & Look for Destination" activities doesn't return any rows.

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shanice.c commented · Sep 16, 2021 at 08:26 AM

@Felix Möhlmann I am sorry to misunderstand you what you mean. I think maybe I shouldn't use value > 0 as condition to decide whether there are enough resource in the "Code: Determine TaskType" activity, as you mentioned that the other corresponding token will also enter that code. Maybe this makes SQL query unable to get a row to get a resource. I will try to use SQL query result to replace "value > 0" part.

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Felix Möhlmann shanice.c commented · Sep 16, 2021 at 09:41 AM

In the mentioned Assign activity you have the following code to assign the "toStation" value.

//查有空EQ數目
Table tempTable = Table.query("SELECT EQLocation \
FROM EQTable \
WHERE Area = 1 AND Status = 'idle' AND Registered = 0 "); //找第一區&有空&未被選擇
int countTask = tempTable.numRows;

//寫出查到的該資源 的名稱
    Object tempToStation  = tempTable[countTask][1];

In the case that no matching row is found, "countTask" will 0. This will result in an error because 0 is not a valid row for "tempTable[countTask][1]".

Regarding the triggers: There are also a number of tokens waiting in a "Wait for Event".

As soon as an item exits a processor these will re-enter the "Code: Determine TaskType" activity. One of those probably creates a new task, because a processor is available and immediately decrements the table cell again.

I'd suggest you put a break point in the trigger(s) of the processor and all other relevant code to try and pin down where the logic might be going wrong.

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shanice.c Felix Möhlmann commented · Sep 17, 2021 at 08:14 AM

Hi, @Felix Möhlmann Thanks for your help, the most important logic problem is now solved.

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Answer 2 · 2021-09-16T08:05:57Z

shanice.c answered Sep 16, '21 shanice.c commented Sep 16, '21

@Felix Möhlmann

But why the value is decremented again if I have put a delay, and re assigned it's FromStation. Shouldn't it become another new Tasktype, as the token.product label is changed? So the value be decremented will not be the same.

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