Use Case:  Set M6 Tilt Angles

Description:  Set M6 tilt angles

Role(s)/Actor(s): 
Primary: Operator, Maintenance
Secondary: M6

Priority: Critical

Performance: TDB

Frequency: Any time during maintenance operation

Package Assignment:  M6 Subsystem.

Preconditions: 

• M6 is ONLINE
• FS is inactive

Basic Course: 

• Send command SETTILT <alpha,beta> to tilt M6 with given tilt angles (alpha,beta)
  Exception Course: Command failed
• ATCS sends tilt angles to M6

  Interface:  IfM6.Tilting.SetAbs,  IfM6.Tilting.SetRel

  Exception Course: Tilt angles too big
  Exception Course: Command failed
• ATCS returns OK reply

Exception Course: Tilt angles too big

• The tilt angles are too big and would send M6 to limit
  Tilt angle out of range (|tilt| < 6.9 arcsec in each direction)
  Ignore correction
  ATCS returns ERROR reply
  

Exception Course: Command failed

• ATCS returns ERROR reply

Postconditions: 

• M6 Tilt axis are set to the new angles

Issues to be Determined or Resolved: 

Notes:

Last modified: Tue Nov 20 12:58:22 UTC 2001