Operation
5.8.5.2 Position Loop Diagnostics
Position Loop Diagnostics shows the states of the position loop task in real time.
The status (awake or asleep) of the position loop is displayed. If the loop is
awake, the antenna is being actively commanded to a position (or the system is
actively holding the current position). If the system is in Standby or Manual mode,
the loop is asleep and is not commanding the antenna.
The FSM state provides the current status of position loop Finite State Machine
(FSM) for each axis. Table 5-17 describes the possible states of the FSM.
TABLE 5-17 FINITE STATE MACHINE STATES
STATE DESCRIPTION
Slew drive Indicates that the antenna is driving at slew (fast) speed toward the target.
Slew coast Indicates that the antenna is now within the slew->track transition point, waiting for
the antenna to coast to a stop before proceeding.
Track drive Indicates that the antenna is driving at track (slow) speed toward the target.
Track coast Indicates that the position loop has come within the deadband and is waiting for the
antenna to come to a stop.
Inch coast Indicates that the position loop either overshot the positioning deadband on the way
to the target, or the antenna has drifted outside the positioning deadband and the
antenna is inching back to the deadband.
On target Indicates that the antenna is within positioning deadband of the target.
Unknown Indicates that the FSM has not been used since power-up of the ACU.
Outputs Shows (in the form rate, direction), the rate and direction in which the antenna is
being driven. For example, slew CCW indicates that the antenna is moving CCW at
slew rate. If the antenna is not being commanded, this line indicates Track Stop.
Distance to target Shows how far the antenna has to move to get to the commanded position. Positive
value means move up/CW to get to the target.
5.8.5.3 Steptrack Statistics
The Steptrack statistics provide real-time information when the Steptrack active
field is true. When Steptrack inactive is true, the final values at completion of the
last steptrack operation are displayed. Table 5-18 describes the steptrack
statistics.
5-41
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