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CompactLogix 5069 misses a 5 ms reject pulse from a checkweigher, fine in Emulate

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(@valh7)
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Joined: 2 years ago
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Topic starter   [#181]

Line 4, biscuit packs. CompactLogix 5069-L320ER, the checkweigher gives a dry contact reject pulse into a 5069-IB16, and the reject rung sets a bit with a TON delaying it to the flipper, continuous task.

Since we took the line from 60 to 90 packs a minute we lose a reject every 30 or 40 packs, so the underweight pack carries on down the line. I scoped the contact and the pulse is about 5ms and clean.

Moved the reject rung to the top of MainRoutine first and that changed nothing, then I went back to the checkweigher people and they say the pulse is fixed at 5ms and won't be widened. It never misses in Emulate, but there the input sits on for a whole second, so that proves nothing.

Is the IB16 too slow for this or is it my program? Is there something on a 5069 that'll catch a 5ms pulse without me rewriting the reject rung, because I'm out of ideas?


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(@mikko)
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Firmware and Studio version? And what's the continuous task scan, Controller Properties, Tasks tab, Max Scan Time. Also is it a plain 5069-IB16 or the IB16F.



   
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(@valh7)
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Joined: 2 years ago
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Topic starter  

V33, controller firmware matches. Plain IB16, RPI 5ms. Continuous task last scan 12ms, max 20ms since the speed change, the program's got bigger too. 90 ppm is a pack every 660ms so it isn't a rate problem.



   
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