Navigation errors on control points attached to intersections

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Sakamoto Ko asked Aug 29, '23 Ryusuke T commented Sep 11, '23

Navigation errors on control points attached to intersections

In this model, each control point is attached to an intersection.

There is no problem if you simulate this model as is.

However, the following operations will cause navigation errors
・Relocate the control points that are Location of Source1 and Queue1.
・Relocate the AGV routes that enter the control points that are Location of Source1 and Queue1. (AGV paths in the red box in the figure below)
・Open the AGV Network property.

It has been confirmed that this error can be resolved by relocating the AGV paths exiting the intersection. Furthermore, we have confirmed that changing the order of each path in the model tree can suppress the occurrence of this error.

However, this means that when building AGV paths in FlexSim2023, one must always be careful about the order in which they are placed in the model and the order in which they are edited.

While this may be possible for a simple model like the sample, it may be difficult to control it perfectly for a more complex, larger-scale model.

Please investigate this error.

Thanks in advance.

Software Version:

FlexSim 23.0.8

agv agvnetwork agvpath

pathimage.png (1.4 MiB)

errormesse.png (1.5 MiB)

attachcontrolpointstointersections.fsm (32.0 KiB)

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Answer 1 · 2023-08-29T14:59:40Z

Phil BoBo answered Aug 29, '23 Ryusuke T commented Sep 11, '23

The issue is the AGV's offset travel calculation isn't finding a valid control point. (Hence why the Destination in the error message is blank.)

You can fix this by changing the offset travel property on the AGV from "Use navigator for offset travel" to "Do not travel offsets for load/unload tasks."

Since you haven't configured the On AGV Offset Travel trigger to actually do anything for offset travel, then you don't need to use the navigator for offset travel:

I'll add a case to the dev list to look into why the offset travel is giving a navigation error instead of doing nothing in this particular situation, but you can easily fix it in the model by changing the AGV's offset travel setting as described above.

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Matthew Gillespie ♦♦ commented · Sep 08, 2023 at 07:15 PM

@Sakamoto Ko This issue has been fixed in 23.0.11 and 23.2.1 released today.

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Ryusuke T Matthew Gillespie ♦♦ commented · Sep 11, 2023 at 01:03 AM

@Phil BoBo , @Matthew Gillespie ,

I have confirmed that this issue has been fixed.

Thank you for your response!

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Sakamoto Ko commented · Sep 06, 2023 at 04:19 AM

@Phil BoBo

Sorry, I did not send a reply.

I was able to fix the error immediately with the method you gave me.

And, thank you also for adding investigation of the error to the dev list.

For the time being, we will be careful not to place control points with On AGV Offset Travel on intersections in our modeling.

Thank you very much for your response.

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