HI, -- Yesterday I asked a question about connecting a Power-flex 400 to a 22-comm-D (Device Net to DSI communication adapter) with the purpose of talking to the VFD over Device Net – obviously! Since then i have stepped back, and with new cost info, i have a different question.
Question: What benefit is obtained from using Device Net (or Ethernet/IP) with a VFD? That is, is there any PLC to VFD communication (beyond setup) that can’t be done with digital & analog output cards?
This really matters as the added cost of putting DeviceNet onto this system includes the following:
- 22-COMM-D "DeviceNet to DSI communication adapter (probably 1 for each of 2 drives)
- 1784-PCD (special pcmia card) for laptop to configure the adapter.
- PC Software "DriveExplorer Lite" - free
- 1788-EN2DN (brick to interface EtherNet/IP to DeviceNet)
This seems like an extra odinary complication to control start/stop and speed on a VFD. I really need a better reason for using DeviceNet! (or Ethernet/IP).
**narlin
Question: What benefit is obtained from using Device Net (or Ethernet/IP) with a VFD? That is, is there any PLC to VFD communication (beyond setup) that can’t be done with digital & analog output cards?
This really matters as the added cost of putting DeviceNet onto this system includes the following:
- 22-COMM-D "DeviceNet to DSI communication adapter (probably 1 for each of 2 drives)
- 1784-PCD (special pcmia card) for laptop to configure the adapter.
- PC Software "DriveExplorer Lite" - free
- 1788-EN2DN (brick to interface EtherNet/IP to DeviceNet)
This seems like an extra odinary complication to control start/stop and speed on a VFD. I really need a better reason for using DeviceNet! (or Ethernet/IP).
**narlin