Yaskawa E7B Drive Bypass - Manual (Page 278)

Communications D - 18
Mailbox Function Points
Reading a Drive Parameter
Two points are defined for reading any Drive parameter:
AO 30 Specifies the parameter to be read from the E7 Drive
AI 38 Reports the value of the parameter specified in AO 30
When this point is read, it retrieves data from the parameter and sends it to the controller
Example:
Writing a value of 387 (183 hex) to AO 30 specifies Drive parameter b1-04. Reading AI 38 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:
AO 31 Specifies the parameter to be written to
AO 32 Entry location of the value to be written to the parameter specified in AO 31. 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 lim-
ited number of Drive parameters that can be written to.
Example:
Writing a value of 387 (183 hex) to AO 31 specifies Drive parameter b1-04. Writing a value of 1 to AO 32 enables the
Drive for reverse run.