Emerson Exchange 365

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I am looking to control a Powerflex 753 drive with a 32 bit DINT

I am looking to control a Powerflex 753 drive via DeviceNet.  I have communication with the drive and can stop and start and even control the speed, just not easily.  My issue is that I need to send a 32bit DINT to the drive for a speed command.  I just want to take a 0-100 % and convert it to that 32 bit DINT.  I have tried a Scaler but the DINT is not linear. 

I have a block that will do what I need, in reverse, as i am converting the DINT's from the drive to Real (ie. Amps). 

Is there a BFI with a 32 IN's??  I have another Block that i could use if there was a 32 BFI. 

If anybody with way better programming skills that can help I would greatly appreciate it.

Kenbo

• 15 Mar 2017 8:30 PM
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2 Replies

• jas

  

  • 15 Mar 2017 9:03 PM

  Hi, Recently completed an upgrade to PF753 over devicenet using 20-750-DNET module and for speed reference to VFD used floating point scaled 0-100% to 0-60 and same for speed feedback ... in the VFD set the speed limits just in case.. not sure if you are using 20-COMM- devicenet adapter .. in which case it may be different

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• Kenbo

  

  • 16 Mar 2017 2:09 PM

  In reply to jas:

  Ha, I never thought of that. I was referencing the tags to a 32bit unsigned int. Making them a floating point did the trick. Not sure how the VFD knows the difference between the two numbers but it does!!. I have been using a 20commD card in the past and this new 750-DNET card has posed some challenges but this worked great. thanks.

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