ABB ACS800-17LC Hardware Manual page 31

Term/Abbreviation
RMIO
STO
THD
Explanation
Motor control and I/O board. The RMIO is a versatile control board and an
IO interface the use of which is determined by the control program loaded
onto the board. The RMIO is widely used in the ACS800 product series,
eg. for controlling drive modules, inverter units, supply units, cooling units,
brake units, etc. See also RDCU.
Safe torque off function
Total harmonic distortion
Introduction to the manual
25