adccommunitymod (AutomationDirect) asked a question.
Created Date: May 11,2011
Created By: Wallaby
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Hi, This is my first time attempting to use Directsoft 5. This is what I am attempting to do for a final for an Automation Class I'm in: Normally Open >Switch(Closing the Open Circuit) > Timer (3 seconds) > Solenoid >Timer(10 Seconds) > Solenoid Reset Normally Open >Lever Action Microswitch(LAM)(Closing the Open Circuit) > IF Then Statement(IF 1st LAM tripped) >LED on > Confetti Cannon Normally Open > LAM(Closing the Open Circuit) > If Then Statement(If 1st LAM tripped) > LED on > Confetti Cannon I have managed to get a normally Open first rung with a Timer on the end of it, I have run into a wall trying to get the switch to close the circuit and anything further than that. We only had a single day of in class instruction on this programming hence why I'm running into these problems. Any Assisstance you could offer with this would be extremely appreciated. Thank You, Wallaby
Created Date: May 11,2011
Created by: Wallaby
Understand one part of it
I figured out that there is no need for a coil or something that closes the normally open circuit so I have figured out all of my programming excepting the "if " statements. To make it more understandable what i am trying to accomplish here is the scenario. Two Cars are going down a track and when they hit the Lever Action Microswitch if they were the first of the two they will light up the LED above that lane signifying that it came in first place.
Any assistance would be appreciated thanks in advance
Wallaby.
Created Date: May 11,2011
Created by: bcarlton
Pinewood Derby?
The solenoid is the release?
It is possible for the two switches to be made on the same scan. Are 'ties ' allowed?
Attached is one possible method
Created Date: May 11,2011
Created by: Wallaby
Yes, it is a pinewood derby.
The solenoid is our release, and i suppose ties aren't going to be allowed for the simplicity of the project.
How do you mean attached for a possible method?
Thanks,
Wallaby
Created Date: May 11,2011
Created by: bcarlton
In my post there is a zipped attachment. if you download that and unzip it you will see it is a DL05 project attempting to fulfill the requirements you described. It may provide some inspiration.
A 'tie ' would have been if both switches are made in the same scan (check your scan time, on the order of 1/100th of a second). In my example Lane 1 would get the 'win ' in that case.
Created Date: May 16,2011
Created by: Herman
A 'tie ' would have been if both switches are made in the same scan (check your scan time, on the order of 1/100th of a second). In my example Lane 1 would get the 'win ' in that case.
This shows that a PLC alone is inappropriate here, please add two DPDT relays that latch and switch each other off when energized.
Two relay outputs could be connected to the PLC to indicate the winner.
Then, the problem with false end results (If lane 2 beats lane 1, but in the same scan - Lane 2 'loses '...) will be gone.
Created Date: May 16,2011
Created by: bcarlton
Theoretically a tie could still result. Cross coupled switches would result in no car winning. It's all a matter of how finely you want to discriminate.
Created Date: May 16,2011
Created by: Herman
It's all a matter of how finely you want to discriminate.
Well if I would have carefully worked hours on my son's Pinewood Derby car, to make it even faster than the other scouts ' (daddys ') cars, I'd make sure it would approach the theoretical finite Pinewood Derby car speed of more than 16 feet per second. Then, during the assumed 10 ms scan time, the cars would travel almost two inches.
So, if the the judging were done by PLC alone, I'd make sure my (son's) car would be in Lane 1 because even if it would trail more than an inch behind the one in Lane 2, I (oops, I mean, my son) would likely win anyway.
Created Date: May 16,2011
Created by: bcarlton
Of course we had not advanced as far as using the interrupt capability of the DL05. I was saving that until at least the basics was understood.
And 'same scan ' could have been programmed to be a tie.
Created Date: May 11,2011
Created by: Wallaby
Hi,
This is my first time attempting to use Directsoft 5.
This is what I am attempting to do for a final for an Automation Class I'm in:
Normally Open>Switch(Closing the Open Circuit)> Timer (3 seconds)> Solenoid>Timer(10 Seconds)> Solenoid Reset
Normally Open>Lever Action Microswitch(LAM)(Closing the Open Circuit)> IF Then Statement(IF 1st LAM tripped)>LED on> Confetti Cannon
Normally Open> LAM(Closing the Open Circuit)> If Then Statement(If 1st LAM tripped)> LED on> Confetti Cannon
I have managed to get a normally Open first rung with a Timer on the end of it, I have run into a wall trying to get the switch to close the circuit and anything further than that. We only had a single day of in class instruction on this programming hence why I'm running into these problems.
Any Assisstance you could offer with this would be extremely appreciated.
Thank You,
Wallaby