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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.
LED
Color
Pb R
Yellow
Pb S
Yellow
Pb T
Yellow
RSrc
Yellow
SSrc
Yellow
TSrc
Yellow
Aux
Yellow
125V
Yellow
125G
Yellow
125D
Yellow
125P
Yellow
App1
Yellow
24V
Yellow
24G
Yellow
24D
Yellow
24P
Yellow
App2
Yellow
App3
Yellow
AC1
Yellow
AC2
Yellow
ACA
Yellow
ACP
Yellow
Fault
Red
PDM Power Distribution Modules
Power Distribution LEDs
Description
Pbus R is in Regulation
Pbus S is in Regulation (not used on JPDG)
Pbus T is in Regulation (not used on JPDG)
All R Pbus Sources OK
All S Pbus Sources OK
All T Pbus Sources OK (not used on JPDG)
Aux 28 outputs OK
125 V battery volts OK
125 V battery floating
125 V JPDD feeds OK
125 V Pbus feeds OK
Application driven
24/48 V battery volts OK
24/48 V battery floating
24/48 V JPDD feeds OK
24/48 V Pbus feeds OK
Application driven
Application driven
Ac input 1 OK
Ac input 2 OK
Ac JPDA feeds OK
Ac Pbus feeds OK
Fault Led - Application driven
Public Information
Variable
Pbus_R_LED
Pbus_S_LED
Pbus_T_LED
Src_R_LED
Src_S_LED
Src_T_LED
Aux_LED
Batt_125V_LED
Batt_125G_LED
JPDD_125D_LED
Pbus_125P_LED
App_1_LED
Batt_24V_LED
Batt_24G_LED
JPDD_24D_LED
Pbus_24P_LED
App_2_LED
App_3_LED
AC_Input1_LED
AC_Input2_LED
AC_JPDA_LED
AC_Pbus_LED
Fault_LED
GEH-6855_Vol_II System Guide 313
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