What is the difference between the ATV61 and ATV71?

Issue:
What are some differences between the ATV61 and ATV71

Product Line:
ATV61 and ATV71

Environment:
All models and serial numbers

Cause:
None

Resolution:
The ATV61s are designed for variable torque applications such as fans and pumps.  The torque requirement is less at lower speeds.
The ATV71s are designed for constant torque application such as positive displacement pumps, mixers, conveyors, hoisting application, ect...  The torque for these application are the same at the lower speeds and the higher speeds.  
Communication Options are:   
Modbus TCP Daisy chain EtherNet/IP DeviceNet Modbus/Uni-Telway PROFIBUS DP V0 PROFIBUS DP V1 ATV61 (ONLY) –  LonWorks VW3A3312, Bacnet VW3A3319, Apogee FLN P1 VW3A3314, Metasys N2 VW3A3318