Use Case:  ATCS Cold Start

Description:  This is the normal operation after a system complete or partial power-up or reboot.
Each required subsystem is brought from state OFF to state STANDBY and initialized.
A failure will leave the ATCS in state OFF substate ERROR.

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

Priority: Major.

Performance: 10 minutes

Frequency: Typically, after relocation procedure.

Package Assignment:  Mode Switching.

Preconditions: 

• ATCS is in state OFF
• ATCS ready to accept Mode Switching commands

Basic Course: Cold start automatically

• Send command CSTART to ColdStart ATCS
  Exception Course: Command failed
• ATCS initializes and puts in STANDBY all required and not ignored subsystems

  by using Standard Command

  Exception Course: Some sub-systems failed to initialize or to go to STANDBY
  Postcondition: all required and not ignored subsystems are initialized and in STANDBY state
• ATCS global system state update
  Postcondition: ATCS in state STANDBY, substate IDLE
• ATCS sends final OK reply

Alternate Course: Cold start manually

• Initialize and puts in STANDBY all required and not ignored sub-systems one by one

  by using Standard Command from the Control GUI

  Exception Course: Some sub-systems failed to initialize or to go to STANDBY
  Postcondition: all required and not ignored subsystems are initialized and in STANDBY state

Exception Course:  Command failed

• ATCS global system state update
  Postcondition: ATCS in state OFF, substate ERROR
• ATCS sends final ERROR reply

Exception Course:  Some sub-systems failed to initialize or to go to STANDBY

• ATCS global system state update
  Postcondition: ATCS in state OFF, substate ERROR
• Ignore sub-systems that failed
  Alternate course: Retry to Cold start manually for failed sub-systems

Postconditions: 

• ATCS is in state STANDBY, substate IDLE
• All required and not ignored ATS subsystems are initialized and in STANDBY
• Control loops are disabled and brakes engaged

  (Interface:  IfAltDrive IfAzDrive )

  
  

Issues to be Determined or Resolved: 

Notes:

Last modified: Thu Jun 28 13:32:50 UTC 2001