Mitsubishi Electric FR-A8AX Instruction Manual page 28

The input signal uses the last 15 (11) bits as torque command and the most significant bit as sign.
When 16-bit is selected
Bit15
NOTE
• The digital torque command is input only as a binary input.
• When a digital torque command is selected, Pr.329 Digital input unit selection becomes disabled.
28
PARAMETER
Sign bit
0: positive, 1: negative
0 to H7FFF
Bit0