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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