stop/resume item on message

Question

question

Mia asked Nov 27, '23 Jason Lightfoot commented Nov 28, '23

stop/resume item on message

微信图片-20231127194711.png stop_resume_item_onmessage.fsm 2.fsmI tried to stop a item on arrival by processflow, but when I tried to resume , it failed to.

There are two methods I used:

first model I used wait-event until DP1 receive message , it not work

second model I used custom coder such as

if (objectexists(current.stoppedItem)) {

conveyor.itemData[current.stoppedItem].resume();

current.stoppedItem=NULL;

},it still not work.

Can you help me find why my model not work?

Software Version:

FlexSim 22.0.16

item stop and resume onmessage

微信图片-20231127194711.png (50.1 KiB)

stop-resume-item-onmessage.fsm (44.5 KiB)

2.fsm (43.1 KiB)

Answer 1 · 2023-11-27T16:45:49Z

Jason Lightfoot answered Nov 27, '23 Jason Lightfoot commented Nov 28, '23

You're reassigning item with a value that is not the item from your user event. Remove the item reference from your WaitForEvent and it will work.

(The user event is currently sending itself as the sending object, which you're then assigning to the token's item label).

For synchronization it might be better to use the push/pull mechanism of lists rather than messages which can result in extensive case statements within a single on message code and is not as state/memory aware.

· 2

Mia commented · Nov 28, 2023 at 01:22 AM

Thanks.That's make sense. I'm really interested in "use the push/pull mechanism of lists",can you tell me more about it ? how can I use a pull-list to stop and resume items?

0 ·

Jason Lightfoot ♦ Mia commented · Nov 28, 2023 at 11:52 AM

Here are some links. You can just have one token pull from a list (checking for a value or partition if needed) and another event pushing to the list.
Lists functional reference.
Shared Assets.

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Answer 2 · 2023-11-28T01:32:42Z

Mia answered Nov 28, '23

new.fsmI modified the wait-event，this is the new model that works.

new.fsm (45.7 KiB)

Answer 3 · 2023-11-27T16:38:35Z

Joerg Vogel answered Nov 27, '23 Mia commented Nov 28, '23

A photoeye sends delayed messages to stop and resume items on involved conveyor On Message trigger.

stop_resume_conveyoritem_by_message_of_PE.fsm

stop-resume-conveyoritem-by-message-of-pe.fsm (38.2 KiB)

· 1

Mia commented · Nov 28, 2023 at 01:18 AM

I want to use Decision point instead of photoeye but still thank you very much for your code I figured out my mistake.

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