Boolean Logic Issue

I have 2 sensors in a system.
Items pass these sensors.
First is an inductive sensor and only activated by a passing metal object, which is what we want.
Second is an IR Through Beam - if the Inductive sensor activates it means a metal object has passed so the second IR Through beam is redundant in that case
If the IR Through Beam is broken and the Inductive HASN'T been activated, it means the passing object isn't metal (in this case it's plastic).
So if Inductive is (A) and IR is (B)
Metal:
(A) will activate on its own very briefly
(B) activates also
(A) deactivates
(B) still activated on its own for a very brief period
(B) deactivates
Plastic:
(B) activates on it's own
(B) deactivates
I've knocked up a VI and Metal is easy enough - if (A) is activated, using an implies and not gate, I can make sure only once it enqueues 'metal'
But for the Plastic on, it works most of the time, but sometimes puts 'reject' onto the queue when a metal passes - i'm assuming that because of the subVI iterating quickly and the period when (B) remains on alone, this somehow picks it up as plastic.
Can anyone see where i'm going wrong?
Cheers
without getting this first bit right I can't sort the second inspection part as it relies on a successful decision from the first section to fully assertain what to do at the reject area following - nightmare!
Attachments:
InspectionArea.vi ‏52 KB

Hi there tbob
the VI is a subVI in a while loop, along with other subVIs, so the frequency of the code running has been ok - it's in a loop with a 100ms delay - all these 6 subVIs seem to run as expected and are doing ok in that respect (as far as I know )
I'll try to answer your questions now........
' Could you explain what is your desired end result?'
Basically, there are 4 sensors along a conveyor belt, split into 2 groups of two. The first two are an inductive and infra-red through beam, the second two are an infra-red reflective sensor and a large capacitive sensor (I have attached a photo of the two sections in question to get a feel for it - conveyor goes left to right - if, as you can see, a metal based object passes the left section, it activates the inductive sensor (the blue one), then the infra-red beam (the bit under the blue frame) is broken shortly after (so now both sensors are active), then the trailing edge of the metal peg leaves the field of the inductive sensor and the inductive sensor deactivates - and now the infra-red through beam is still broken momentarily before the metal object fully passes. If it was a plastic ring passing (a plastic ring can just be seen in the assembly hopper on the far left of the picture), the inductive sensor would not be activated, with only the IR through beam being broken. One problem I was getting is that sometimes a passing metal is getting put down as both metal and plastic - presumably due to the last part where only the IR through beam is broken.
'Do you want to put reject in the first queue if the object is non-metal and put metal base in the second queue if the object is metal?'
Yes and no...............either 'reject' or 'plastic base' (the wording is inconsequential I suppose) onto the first queue for non-metal and 'metal-base' onto the first queue instead for metal (I am using the second queue for the second stage of the inspection as can be seen just after on the picture.
'Also, does the conveyor belt run such that one object passes both sensors before the next object gets to the first sensor, or can you have a case where you have objects at both sensors at the same time.'
The way it works with the spacing of objects as they are fed into the machine (there is a chain conveyor with uniform spacing, as can be seen in the background), only one object should be in the field of these sensors at a time BUT there is always the risk that something could be placed on manually and cause that situation to be true - that's all part of a final critical evaluation I suppose - not being able to properly identify anything in the system, only 'assuming'.
I think the question about the loops shouldn't be an issue - the profiling suggests not
sorry, i've waffled a bit there - think that answers everything!
thanks
Attachments:
Inspection.jpg ‏57 KB

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