adccommunitymod (AutomationDirect) asked a question.
Created Date: July 13,2007
Created By: Sawz
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Have a C-more/205 application coming up. The 205 will be used to control discrete I/O on some machinery. The C-more will be used for machine function monitoring and adjustment of machine timing functions through the 205. However, I also want to use the C-More to Start/Stop, adjust speeds, etc on 7 A-B Powerflex 40 Drives. Since both the C-More and the A-B drives support RS-485, it would appear this is feasible. However, I do not want to commit until I am certain this can be done. Has anybody out there done this? If so, please advise method and potential issues.
Created Date: July 13,2007
Created by: Steve Bailey
RS485 is an electrical standard. It's only part of the task of communication between two devices. Both the drive and the C-More have to be set up to use the same protocol.
What protocols are available on the drive?
Created Date: July 13,2007
Created by: Sawz
Thanks for the reply.
The A-B manual states as follows:
RS485 (DSI) Protocol
PowerFlex Drives support the RS485 (DSI) protocol to allow efficient operation with Rockwell Automation peripherals. In addition, some Modbus functions are supported to allow simple networking. PowerFlex drives can be multi-dropped on an RS485 network using Modbus protocol in RTU mode.
Does that help?
Created Date: July 13,2007
Created by: Steve Bailey
The C-More has Modbus RTU protocol available as a choice.
Modbus RTU is a point-to-point protocol, meaning that the C-More, as a Modbus master can only communicate with one drive (Modbus slave) at a time. If you want to display the speeds of all seven drives, the C-More will have to execute an individual read command to each drive. Expect to see a perceptible delay between updates from any one drive.
Created Date: July 13,2007
Created by: Sawz
Hi,
Posting speeds is not so important. I mostly just want to be able to Start and Stop and adjust the speed of each drive from the C-More to simplify field wiring.
Regards
Created Date: July 13,2007
Created by: Sawz
Have a C-more/205 application coming up. The 205 will be used to control discrete I/O on some machinery. The C-more will be used for machine function monitoring and adjustment of machine timing functions through the 205.
However, I also want to use the C-More to Start/Stop, adjust speeds, etc on 7 A-B Powerflex 40 Drives. Since both the C-More and the A-B drives support RS-485, it would appear this is feasible.
However, I do not want to commit until I am certain this can be done.
Has anybody out there done this? If so, please advise method and potential issues.