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MICROMASTER

DI switching of MM420,440

Thread Starter: M.S.Gaur   Started: 4/2/2011 9:38 AM   Replies: 3

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  4/2/2011, 9:38 AM
M.S.Gaur
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Dear all,
minimum filter time for mm420,430,440 is too high.i fced problems to read fast switching data from plc though direct connection.is ther any solution for it.
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  4/2/2011, 11:47 PM
Vitas
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Hello M.S.Gaur,

the solution depend on requirement of Your technology. You can read this impulse with PLC by High Speed Counter card (in the rack or ET) and value send by Profibus to next processing in the drive MM420/440.
But You have to know, that transfered value will have some delay (bus cycle, etc.)

Or You can try solve this problem via optional encoder card of Micromaster and free programmed block of MM, but You have to adapt signal voltage to max. input voltage of encoder card.

Some problems are difficult to solve without comprehensive information about them.

 

Vitas
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  4/5/2011, 8:30 AM
M.S.Gaur
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Thanx vitas,
let me explain the problem in detail.
i am increse n decreasing the speed of Motor by digital pulse to mm420.what the problem is by every on-off pulse drive increase the frequency by 0 .1 heartz.and minimum time for one pulse that could be read by drive is 13ms.so i have to wait for 13ms after every 0.1 hearts icrement or decrement.so for going from 0 to 50 heartz i have to wait for 13*500=6500ms means 6.5 sec.but required time is 3sec.so what i was asking that is it posible to reduce this 13ms scan time in drive.

will this problem be continued in snamics series.

by the way thanks for your suggetion.laugh
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  6/6/2011, 8:26 PM
Vithani
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I think you have to adjust ramp times.. By shortening ramp up time, frequency will change rapidly rather 0.1 per pulse as in your case..

And for digital inputs, cycle time is 2 ms so it will update status at evry 2ms..

So rapid your DI on/off and shortenung ramp time should solve your problem

Regards
Devesh
I dont Like people driving Fast, thats the reason I overtake them ;)
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