http://www.mrostop.com/resource-center/mitsubishi-d700-vfd
The Mitsubishi D700 VFD is the Low Cost direct replacement for the S500 & S500E Variable Frequency Drives and includes the following improvements:
Improved speed range. 150% or more motor torque is now possible at 1 Hz using General Purpose Magnetic Flux Vector control, giving a smooth open loop speed range of 60:1.
More interoperability. The D700 communications include Modbus RTU as well as Mitsubishi Electric’s own RS 485 programming protocol (supported as standard).
Remote operation. Drive I/O can be remotely operated over any supported network, regardless of what the drive is doing.