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Command Processing
2.6 Power Condition
The IDD has three power condition states: Active, Active_Wait, and Stopped.
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Active_Wait state
In this state, the IDD is waiting for motor start with NOTIFY (ENABLE
SPINUP). When the IDD receives a command that cannot be executed due to
"not ready" during this state, the IDD reports the CHECK CONDITION status.
In this case, "NOT READY [= 02]/LOGICAL UNIT NOT READY, NOTIFY
(ENABLE SPINUP) REQUIRED [= 04-11]" is reported as sense data.
When the IDD receives NOTIFY (ENABLE SPINUP), it starts the motor.
The IDD enters the Active state after the motor is successfully started. When
the IDD receives a command that cannot be executed due to "not ready"
while starting the motor, the IDD reports the CHECK CONDITION status.
In this case, "NOT READY [= 02]/LOGICAL UNIT IS IN PROCESS OF
BECOMING READY [= 04-01]" is reported as sense data.
When the IDD receives the STOP command, it enters the Stopped state.
•
Active state
In this state, the drive is ready.
•
Stopped state
In this state, the IDD is waiting for the START command. When the IDD
receives a command that cannot be executed due to "not ready," the IDD
reports the CHECK CONDITION status. In this case, "NOT READY
[= 02]/LOGICAL UNIT NOT READY, INITIALIZING COMMAND
2-12
Active_Wait
NOTIFY
(ENABLE SPINUP)
Stopped
STOP
START
Active
STOP
C141-C009
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