Yaskawa E7B Drive Bypass - Manual (Page 285)

Communications D - 25
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 cur-
rent 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 MODBUS ® Technical Manual for MODBUS ® communication set-up and
configuration. The E7 User's Manual and the E7 MODBUS ® Technical Manual provide a reference to E7 Drive parameters
and their respective Drive addresses.