Yaskawa E7 Apogee FLN - Manual (Page 39)

Mailbox Function 6-3
Mailbox Function Points
! Reading a Drive Parameter
Two points are defined for reading any drive parameter:
#70 Specifies the parameter to be read from
#71 Reports the value of the parameter specified in Point #70
When this point is read, it retrieves data from the parameter and sends it to the controller
Example:
Entering a value of 387 (183 hex) in Point #70 specifies drive parameter b1-04. Reading Point #71 returns the current setting of
parameter b1-04 to the controller
Writing to a Drive Parameter
Two points are defined for writing to any drive parameter:
#72 Specifies the parameter to be written to
#73 Entry location of the value to be written to the parameter specified in Point #72
When this point is written to, it will write the value to the drive. An enter or accept command does not need to be sent for the
data to be taken by the drive. The behavior of the write is the same as with the digital operator. If the drive is running, there are a
limited number of drive parameters that can be written to.
Example:
Entering a value of 387 (183 hex) in Point #72 specifies drive parameter b1-04. Commanding Point #73 to a value of 1 enables the drive
for reverse run.
Refer to the either the E7 User’s Manual or the E7 Programming Manual for MODBUS  communication set-up and configuration. The
E7 User’s Manual and the E7 Programming Manual provide references to E7 drive parameters and their respective drive addresses and
functions.