Use Case:  Read Telescope Temperature Sensors

Description:  Read the telescope temperature sensors

Role(s)/Actor(s): 
Primary: Operator/Maintenance
Secondary: Services

Priority: Desirable.

Performance: TBD

Frequency: At any time

Package Assignment:  Services.

Preconditions: 

• AirConditioning sub-system is ONLINE or STANDBY

Basic Course: 

• Send command GETTEMP <sensor> to read the temperature in the enclosure, and/or all or the specified temperature sensor(s)
  Exception Course: Command failed
• ATCS reads the requested temperature values:
  • Subflow: Enclosure temperature
  • Subflow: All temperature sensors
  • Subflow: 2 Tube temperature sensors
  • Subflow: Top Ring temperature sensor
  • Subflow: 2 Fork temperature sensors
  • Subflow: Mirror M7 temperature sensor
  • Subflow: 3 Mirror M1 temperature sensors
  Exception Course: Command failed
• ATCS returns the requested temperature value(s)

Subflow: Enclosure temperature

• ATCS sends the command to the AirConditioning sub-system PLC

  Interface:  IfAirConditioning.GetEncTemp

  Postcondition: Enclosure temperature is available

Subflow: All temperature sensors

• ATCS reads all the 9 PT100 Temperature sensors

  Interface:  IfTempSensors.AllSensors

  Postcondition: All 9 temperature values are available

Subflow: Tube temperature sensor

• ATCS reads the 2 PT100 Temperature sensors of the Tube

  Interface:  IfTempSensors.TubeA, IfTempSensors.TubeB

  Postcondition: 2 Tube temperature values are available

Subflow: Top Ring temperature sensor

• ATCS reads the PT100 Temperature sensor of the Top Ring

  Interface:  IfTempSensors.TopRing

  Postcondition: Top Ring temperature value is available

Subflow: Fork temperature sensor

• ATCS reads the 2 PT100 Temperature sensors of the Fork

  Interface:  IfTempSensors.ForkA, IfTempSensors.ForkB

  Postcondition: 2 Fork temperature values are available

Subflow: Ground Interface Structure temperature sensor

• ATCS reads the PT100 Temperature sensor of the mirror M7

  Interface:  IfTempSensors.M7

  Postcondition: Mirror M7 temperature value is available

Subflow: Mirror M1 temperature sensors (3)

• ATCS reads the 3 PT100 Temperature sensors of the mirror M1

  Interface:  IfTempSensors.M1A, IfTempSensors.M1B, IfTempSensors.M1C

  Postcondition: 3 Mirror M1 temperature values are available

Exception Course: Command failed

• ATCS returns ERROR reply

Postconditions: 

• The requested temperature value(s) is(are) returned

Issues to be Determined or Resolved: Sauter and PKC PLC protocols

Notes:The 9 PT100 temperature sensors are read out by an VME Analog I/O board on the Altitude LCU (slave CPU); the values are made available on the master CPU via the Shared Memory. The monitoring frequency is to be configured from the RTC running on the Slave CPU.

Last modified: Wed Jul 4 13:48:56 UTC 2001