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F.7 Mailbox Function
F.7
Mailbox Function
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Reading Drive Parameters
Two points are defined for reading drive parameters:
• AO 30 – Specifies the parameter to be read from the bypass.
• 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.
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Writing Drive Parameters
Two points are defined for writing to drive parameters:
• 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 limited 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 sets b1-04
to 1 and disables the drive for reverse run.
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YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
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