Dog interval control using motor

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AboElfadl asked Jan 20 2024 at 9:26 PM AboElfadl commented Jan 23 2024 at 6:30 PM

Dog interval control using motor

In a specific section of my production line, I have a monorail with a fixed number of hooks, and I'm simulating these hooks using intervals of 1-meter gap between the flow items using dog intervals. However, I'm encountering an issue where some hooks are free and not carrying an item. I want the monorail to wait for the "Dog" to be ready so that it doesn't miss any dog.

How can I ensure that the monorail waits for the "Dog" to be ready to maintain the desired intervals?
I want my model to do the same behavior as the picture.

Motor Control_Dog Intervals.fsm

Software Version:

FlexSim 23.2.2

dog interval motors

1705786000370.png (221.1 KiB)

motor-control-dog-intervals.fsm (41.6 KiB)

Answer 1 · 2024-01-22T07:55:05Z

Felix Möhlmann answered Jan 22 2024 at 7:55 AM AboElfadl commented Jan 23 2024 at 6:30 PM

You'd need to build a control logic that stops the conveyor, waits until an item is available, runs the conveyor for 1 dog interval and then stops the conveyor again and so on.

motor-control-dog-intervals-fm.fsm

motor-control-dog-intervals-fm.fsm (46.4 KiB)

· 7

AboElfadl commented · Jan 22 2024 at 2:29 PM

Thank you very much for your feedback. I just wonder if we can do the same thing without process flow.

I mean using triggers.

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Felix Möhlmann AboElfadl commented · Jan 22 2024 at 5:44 PM

Create a message trigger on the motor that stops it when a message is received ("current.stop()").

In the On Process Finish or On Exit trigger of the processor, resume the motor and send a delayed message to it, with the delay time being equal to the time it takes to convey one dog interval forward.

Object motor = Model.find("Motor1");
motor.resume();
senddelayedmessage(motor, 1, current);

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AboElfadl commented · Jan 23 2024 at 4:55 AM

Now I tried doing the same steps in my model, but the motor doesn't stop, so there are empty dog intervals.
I don't know what I have missed, would you please help me in this issue.

Dog Intervals_Stop Motor.fsm

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1705985662693.png (233.2 KiB)

dog-intervals-stop-motor.fsm (63.3 KiB)

Felix Möhlmann AboElfadl commented · Jan 23 2024 at 7:59 AM

The robot arm is currently not used, so the Wait for Event activity never releases the token. And apparently there is a weird interaction where the conveyors run despite the motor being stopped, when the dogs were not itinialized at the point when the motor was stopped.

Either make the transfer actually use the robot or choose a different event to react to (for example the On Entry of the conveyor). The second time the motor becomes the conveyor will stop as well.

You also have to adjust the delay time until the motor is stopped again. In the example the speed and dog interval had a relation of 1:1. This is not the case in this model.

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AboElfadl Felix Möhlmann commented · Jan 23 2024 at 3:41 PM

I am sorry this was a mistake, I made the transfer use the robot. But I don't know how to adjust the relation between the speed and dog interval, would you please help in this.

Dog Intervals_Stop Motor.fsm

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1706024464139.png (188.0 KiB)

dog-intervals-stop-motor.fsm (63.3 KiB)

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