10.2.7 Diagnostics
The PPDA performs the following self-diagnostic tests:
• A power-up self-test including checks of RAM, flash memory, Ethernet ports, and most of the processor board hardware
• Continuous monitoring of the internal power supplies for correct operation
• A check of the electronic ID information from the terminal board, acquisition card, and processor card confirming the
hardware set matches, followed by a check confirming the application code loaded from flash memory is correct for the
hardware set
• The analog input hardware includes precision reference voltages in each scan. Measured values are compared against
expected values and are used to confirm health of the A/D converter circuits.
• Details of the individual diagnostics are available from the ToolboxST application. The diagnostic signals are
individually latched, and then reset with the RESET_DIA signal if they go healthy.
Power Distribution LEDs
LED
Color
Description Variable
Pb R Yellow Pbus R is in Regulation Pbus_R_LED
Pb S Yellow Pbus S is in Regulation (not used on JPDG) Pbus_S_LED
Pb T Yellow Pbus T is in Regulation (not used on JPDG) Pbus_T_LED
RSrc Yellow All R Pbus Sources OK Src_R_LED
SSrc Yellow All S Pbus Sources OK Src_S_LED
TSrc Yellow All T Pbus Sources OK (not used on JPDG) Src_T_LED
Aux Yellow Aux 28 outputs OK Aux_LED
125V Yellow 125 V battery volts OK Batt_125V_LED
125G Yellow 125 V battery floating Batt_125G_LED
125D Yellow 125 V JPDD feeds OK JPDD_125D_LED
125P Yellow 125 V Pbus feeds OK Pbus_125P_LED
App1 Yellow Application driven App_1_LED
24V Yellow 24/48 V battery volts OK Batt_24V_LED
24G Yellow 24/48 V battery floating Batt_24G_LED
24D Yellow 24/48 V JPDD feeds OK JPDD_24D_LED
24P Yellow 24/48 V Pbus feeds OK Pbus_24P_LED
App2 Yellow Application driven App_2_LED
App3 Yellow Application driven App_3_LED
AC1 Yellow Ac input 1 OK AC_Input1_LED
AC2 Yellow Ac input 2 OK AC_Input2_LED
ACA Yellow Ac JPDA feeds OK AC_JPDA_LED
ACP Yellow Ac Pbus feeds OK AC_Pbus_LED
Fault Red Fault Led - Application driven Fault_LED
PDM Power Distribution Modules GEH-6855_Vol_II System Guide 313
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