Mitsubishi Electric MELSEC Q Series User Manual page 22

(1) Between the CPU module and the QD73A1
The CPU module and the QD73A1 transmit control signals and data to each other through the base unit.
Transmitted item
(2) Between the drive unit and the QD73A1
Control signals are transmitted between the drive unit and the QD73A1, and speed commands (analog voltage)
are output from the QD73A1 to the drive unit.
For details, refer to the following.
Page 40, Section 3.5
20
Control signal
Data
Description
Signals that indicate the QD73A1's status or
are related to commands are transmitted.
Data is written to or read from the buffer
memory in the QD73A1 by application
instructions of the CPU module.
Reference
Page 30, Section 3.4
Page 73, CHAPTER 5