10.2.3 PPDA LED Control
The PPDA I/O pack includes a full set of 24 LEDs to indicate power supply status. The function of most is fixed in firmware,
while four provide an opportunity for application specific indications.
LED I/O Pack Text
Signal Content
Firmware
1 Pb R
Pbus R is in regulation Magnitude is 28 ±5%
2 Pb S
Pbus S is in regulation (not used on
JPDG)
Magnitude is 28 ±5%
3 Pb T
Pbus T is in regulation (not used on
JPDG)
Magnitude is 28 ±5%
4 RSrc All R Pbus Sources OK
R PBUS power supply status switch OK
5 SSrc All S Pbus Sources OK
S PBUS power supply status switch OK
6 TSrc
All T Pbus Sources OK (not used on
JPDG)
T PBUS power supply status switch OK
7 Aux
Aux 28 outputs OK
All three aux boolean OK
8 125V
125 V battery volts OK Magnitude is 125 V ± configurable
9 125G
125 V battery floating Volts centered within ± V configurable
10 125D 125 V JPDD feeds OK
Output to JPDD boolean values OK
11 125P 125 V Pbus feeds OK
Booleans on pwr supply feeds OK
12
App1 Application driven Driven by signal space input boolean
13 24V
24 V battery volts OK Magnitude is 24 V ± configurable
14 24G
24 V battery floating Volts centered within ± V configurable
15 24D 24 V JPDD feeds OK
Output to JPDD boolean values OK
16 24P 24 V Pbus feeds OK
Booleans on pwr supply feeds OK
17
App2 Application driven Driven by signal space input boolean
18
App3 Application driven Driven by signal space input boolean
19 AC 1
AC input 1 is OK Magnitude is OK, config range
20 AC 2
AC input 2 is OK Magnitude is OK, config range
21 AC A
AC1 Outputs OK JPDB AC1 output boolean values OK
22 AC P
AC2 Outputs OK JPDB AC2 output boolean values OK
23 JPDR JPDR Src. Select OK Status feedback from JPDR is OK
24 Fault
Application driven Driven by signal space input boolean
308 GEH-6855_Vol_II GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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