How to use Traffic Signal Logic in AGV Network

Question

question

Ankith T asked Jun 14, '22 Felix Möhlmann commented Jun 23, '22

How to use Traffic Signal Logic in AGV Network

Is there any way that traffic signal logic can be implemented on agv 2 way aisle.

lets say we have a agv path as shown in below picture.

when forward going vehicle reaches the 2-Way aisle, they should check the traffic signal logic should apply and if its red then forward going vehicles should stop at a place where it marked blue.

Then it should wait until traffic lights turn green, until then the 2-way aisle should allow vehicle flowing left.

same logic should apply for the vehicles moving left side.

Software Version:

FlexSim 21.1.5

agv control points traffic control control area traffic light

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Patrick Zweekhorst commented · Jun 15, 2022 at 06:57 AM

Hi @Ankith T ,

Maybe this old post has some information for a possible solution for this. The question looks very similar to yours.

Claim two-way AGV path for one direction - FlexSim Community

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Answer 1 · 2022-06-15T08:08:18Z

Felix Möhlmann answered Jun 15, '22 Felix Möhlmann commented Jun 23, '22

My suggestion would be to add the signal control points as agv waypoints. The attached logic can then have the agvs wait based on a label value on the control point.

In the attached model, the 'state' label shows if the signal is currently green or red. If it is red, a second label 'greenTime' shows the model at which it will turn green again. This is used to determine for how long the agv should wait.

The switching of states is done in a simple process flow.

TrafficLightTest_fm.fsm

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trafficlogic.gif (1.5 MiB)

trafficlighttest-fm.fsm (113.3 KiB)

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Ankith T commented · Jun 15, 2022 at 01:29 PM

thanks for the solution this helps a lot, but can i know 2 things,

1. how are you able to allow multiple agv on 2-way aisle without using control points over there?

2. how those traffic lights are changing?

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Felix Möhlmann Ankith T commented · Jun 15, 2022 at 01:45 PM

1. The first control points after the path splits again are set to allow up to 8 simultaneous allocations.

2. That is also part of the process flow. The second activity in each block updates the labels on the respective control point. The last one changes the color of the object next to them.

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Ankith T commented · Jun 15, 2022 at 02:01 PM

thank you so much, this helped me a lot

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Ankith T commented · Jun 21, 2022 at 06:52 PM

how can i change the traffic light time, as of now lights are changing every 15 seconds, what if i want it to be 30 or 60, what are the parameters i have to change to achieve that.

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Felix Möhlmann Ankith T commented · Jun 21, 2022 at 07:30 PM

The delay times in the process flow.

The text is the state of the system for the delay time next to it. The name of the two activities after the delay describes the change afterwards (starts with 'west green', after 15s west switches to red so then the state is 'both red' and so on).

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Ankith T Felix Möhlmann commented · Jun 23, 2022 at 07:16 PM

thank you, i have one more question, can you explain what those triggers means in waypoints. just want know how thus whole logic is working what those commands means.

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Answer 2 · 2022-06-15T05:51:08Z

David Seo answered Jun 15, '22

@Ankith T If you use 'Control Area' object in two-way zone, you can solve your issue.

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