GLAST/LAT > DAQ and FSW > FSW

FSW Requirement 5.3.16.1.1 (prev, next)

Req. 5.3.16.1.1: "Safe Mode Notification from SC"

The SIU FSW shall receive and process a safe-mode notification message from the SC, then execute an operations-defined set of commands designed to place the LAT in a predetermined Safe Mode within 15 seconds.

Basis (help)

[1] (3.3.4.3), [2] (3.2.8.2), [3] (5.3.5)

    1: "Mission System Spec." (NASA 433-SPEC-0001)

      3.3.4.3: "Safe Mode Alert"

      The observatory shall transmit a safe mode alert message upon entering safe mode.

    2: "LAT Instrument - Spacecraft Interface Requirements Doc." (NASA 433-IRD-0001)

      3.2.8.2: "Safe Mode Notification"

      The SC shall notify the LAT across the CTDB when entering safe mode.

    3: "LAT Performance Spec. - Level II(b) Spec." (LAT-SS-00010)

      5.3.5: "Operating Modes"

      The SI shall accommodate the observatory modes of operation identified in the GLAST Mission System Specification (MSS), Section 3.1.15, Modes of Operation. These modes are Sky Survey Mode, Pointed Observation Mode and Safe Mode. Additionally, the instrument must accommodate the spacecraft load shedding function identified in the SI/SC IRD, Section 3.2.7, Fault Protection.

Context (help)

Test(s)

    013a: Operational Modes - Safe Modes

    This test shall verify that the SIU FSW can perform the correct transition of the LAT into Safe Mode upon command, can properly execute the Safe Mode algorithms, and can perform the subsequent recovery via Engineering Mode. It shall also verify the correct response to SAA entry commands and subsequent recovery.