W DOC AIRBUS | AMM A320F

ECAM CONTROL PANEL - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL
1. General
F ECAM Control Panel
F ECAM Control Panel - Electrical Definition
The ECAM control panel (ECP) is a means of dialog between the flight crew and the ECAM system computers. It is located on the center pedestal, in front of the SWITCHING panel.
** ON A/C NOT FOR ALL
2. Functional Description
A. General
When a key is pressed on the keyboard, the ECAM control panel puts the corresponding bit on the output bus.
It will only illuminate the light located in this key when the order from the DMC is received ; and it presents the DMC with the on light configuration by a label on its bus, lighting depending on the status of the DIM and LIGHT-TEST discretes.
B. Logic
The ECP comprises an acquisition part, a processing part and a transmission part.
The ECP keyboard is divided into two parts, one relating to the warning keys (CLR 1 and 2, STS, RCL, EMER CANC, TO-CONFIG), the other relating to the system keys (HYD, ELEC, COND, F/CTL, ALL, APU, PRESS, ENG, FUEL, WHEEL, BLEED, DOOR). The keyboard is connected to a discrete acquisition interface which also receives the DIM and LIGHT TEST aircraft discretes. The acquisition part also processes two high-speed ARINC 429 buses from the Captain and First Officer DMCs. The illumination commands of the lights are found on these buses.
The processing part performs the good operation tests of the ECP. It takes the acquisition results into account to determine :
  • the lights to illuminate
  • the data to be transmitted on the output bus.
The output bus has the data relevant to the warning keys on label 270 (the corresponding bit remains at one while the key is pressed or for eight label transmit periods). In the same way, label 271 contains system key information with the same coding condition as for the warning keys; and label 272 presents the lights configuration and the status of the LIGHT-TEST and DIM discretes to let the FWCs check the ECP. If label 275 is not received by the DMCs, label 272 is sent by the ECP with its SSM in No Computed Data.
Moreover, the ECP output bus presents labels containing data relating to the self-test results.
The power supply board is also monitored and supplies data concerning its operation: this data is put on the output bus, and is available on labels 155 and 156.
For the FWC, the output bus presents two labels coding the ECP software part-number and hardware part-number so that they can be transmitted to the CFDS when the CFDS asks for them. This data is found on labels 160 for the hardware P/N and 161 for the software P/N.
One stage of some keys is directly wired to the connector to ensure availability of the main ECP functions ; these keys are : the CLR, STS, RCL, EMER CANC warning keys and the ALL key providing warning management and system page display, in case of power supply failure or CPU failure.
ECP Output bus
This comprises the labels :
  • 270 (keyboard warning key status)
  • 271 (keyboard system key status)
  • 272 (lights and discretes status)
  • 161 (ECP software P/N)
  • 160 (ECP hardware P/N)
  • 155 & 156 (self-test results).
ECP Input bus
This bus from the DMCs contains a discrete label (275) in High-Speed ARINC 429 format. This label controls illumination of the ECP lights. A bit is associated with each light on this label (See Table).
Nevertheless, as the ECP CPU receives two of three DMCs it must be ensured that the data received from the DMCs is consistent. This is done through the two bits of label 275, as per the following table :
--------------------------------------------------------------------------
! CODE ! Bit No.28 ! Bit No.29 ! DMC meaning !
!------------!-----------------!-----------------!-----------------------!
! 2 ! 0 ! 0 ! Mono display !
!------------!-----------------!-----------------!-----------------------!
! 1 ! 0 ! 1 ! Manual STS or systems !
! ! ! ! or Advisory !
!------------!-----------------!-----------------!-----------------------!
! 3 ! 1 ! 0 ! Engine/Warning !
!------------!-----------------!-----------------!-----------------------!
! 3 ! 1 ! 1 ! Automatic STS or !
! ! ! ! systems !
--------------------------------------------------------------------------

Meaning
  • code 1 : data presented by the DMC to be totally processed except for CLR.
    Bit at 1 causes the corresponding light to come on steady.
  • code 2 : system keys (bits 12 to 22) :
    When the corresponding bit is at 1 on label 275 of the DMC - light comes on steady if the key is pressed or flashes if not pressed.
    Warning keys (bits 26 to 27) :
    Whatever the status of the corresponding keys when the corresponding bit moves to 1, this causes these lights to come on steady.
  • code 3 : only bit 27 is taken into account to illuminate CLR.
NOTE: - CLR and STS are always on steady
- In DMC MONO DISPLAY operation, several lights may be on at the same time.
C. Power Supply
F ECP - Power Supply
The ECP is supplied by a 28VDC busbar. This is the essential DC busbar (401PP).
The CPU power supply system is unaffected by electrical microcuts less than or equal to 10 ms. Beyond this duration, return to normal supply will cause re-initialization of the unit ; this will last for less than 100 ms.
** ON A/C NOT FOR ALL
3. ECP ARINC 429 Output Bus
A. LABEL 270 - ECP Warning Switches
-------------------------------------------------------------------------------
! TITLE ! BIT No. ! VALUE ! MEANING !
!---------!---------!-------!-------------------------------------------------!
! ! 1 ! 1 ! !
! ! 2 ! 0 ! 270 : WARNING SWITCH POSITION !
! ! 3 ! 1 ! !
! LABEL ! 4 ! 1 ! 1) Switch pressed, bit 1 on the bus !
! ! 5 ! 1 ! !
! ! 6 ! 0 ! !
! ! 7 ! 0 ! !
! ! 8 ! 0 ! !
!---------!---------!-------!-------------------------------------------------!
! ! 9 ! ! 0 ) !
! SDI ! 10 ! ! ) Channel 2 !
! ! ! ! 1 ) !
!---------!---------!-------!-------------------------------------------------!
! ! 11 ! ! CLR 1 !
! ! 12 ! ! SPARE !
! ! 13 ! ! STS !
! ! 14 ! ! RCL !
! ! 15 ! ! SPARE !
! ! 16 ! ! CLR 2 !
! ! 17 ! ! EMERGENCY CANCEL !
! ! 18 ! ! TO CONFIG TEST !
! ! 19 ! ! ) !
! DATA ! 20 ! ! ) !
! ! 21 ! ! ) !
! ! 22 ! ! ) !
! ! 23 ! ! ) !
! ! 24 ! ! ) SPARE !
! ! 25 ! ! ) !
! ! 26 ! ! ) !
! ! 27 ! ! ) !
! ! 28 ! ! ) !
! ! 29 ! ! ) !
!---------!---------!-------!-------------------------------------------------!
! SSM ! 30 ! ! 0 ) FW 0 ) FT 1 ) NCD 1 ) NORMAL !
! ! 31 ! ! 0 ) 1 ) 0 ) 1 ) !
!---------!---------!-------!-------------------------------------------------!
! PARITY ! 32 ! ! !
-------------------------------------------------------------------------------

B. LABEL 271 - System Switches
-------------------------------------------------------------------------------
! TITLE ! BIT No. ! VALUE ! MEANING !
!---------!---------!-------!-------------------------------------------------!
! ! 1 ! 1 ! !
! ! 2 ! 0 ! 271 : SYSTEM SWITCH POSITION !
! ! 3 ! 1 ! !
! LABEL ! 4 ! 1 ! !
! ! 5 ! 1 ! !
! ! 6 ! 0 ! !
! ! 7 ! 0 ! !
! ! 8 ! 1 ! !
!---------!---------!-------!-------------------------------------------------!
! ! 9 ! ! 0 ) !
! SDI ! 10 ! ! ) Channel 2 !
! ! ! ! 1 ) !
!---------!---------!-------!-------------------------------------------------!
! ! 11 ! ! ENG ! NOTE : !
! ! 12 ! ! BLEED ! The corresponding bit is on !
! ! 13 ! ! APU ! the bus as long as a key is !
! ! 14 ! ! HYD ! pressed or for 8 transmis- !
! ! 15 ! ! ELEC ! sion cycles. !
! ! 16 ! ! SPARE ! !
! ! 17 ! ! COND ! !
! ! 18 ! ! PRESS ! !
! ! 19 ! ! FUEL ! !
! DATA ! 20 ! ! FLT/CTL ! !
! ! 21 ! ! DOOR ! !
! ! 22 ! ! BRAKES ! !
! ! 23 ! ! ALL ! !
! ! 24 ! ! ) ! !
! ! 25 ! ! ) ! !
! ! 26 ! ! ) SPARE ! !
! ! 27 ! ! ) ! !
! ! 28 ! ! ) ! !
! ! 29 ! ! ) ! !
!---------!---------!-------!------------------!------------------------------!
! SSM ! 30 ! ! 0 ) FW 0 ) FT 1 ) NCD 1 ) NORMAL !
! ! 31 ! ! 0 ) 1 ) 0 ) 1 ) !
!---------!---------!-------!-------------------------------------------------!
! PARITY ! 32 ! ! !
-------------------------------------------------------------------------------

C. LABEL 272 - Light Status
-------------------------------------------------------------------------------
! TITLE ! BIT No. ! VALUE ! MEANING !
!---------!---------!-------!-------------------------------------------------!
! ! 1 ! 1 ! !
! ! 2 ! 0 ! 272 : LIGHT STATUS !
! ! 3 ! 1 ! !
! LABEL ! 4 ! 1 ! !
! ! 5 ! 1 ! !
! ! 6 ! 0 ! !
! ! 7 ! 1 ! !
! ! 8 ! 0 ! !
!---------!---------!-------!-------------------------------------------------!
! ! 9 ! ! 0 ) !
! SDI ! 10 ! ! ) Channel 2 !
! ! ! ! 1 ) !
!---------!---------!-------!-------------------------------------------------!
! ! 11 ! ! ENG ! Bit 1 : light on !
! ! 12 ! ! BLEED ! !
! ! 13 ! ! APU ! !
! ! 14 ! ! HYD ! !
! ! 15 ! ! ELEC ! !
! ! 16 ! ! STATUS ! !
! ! 17 ! ! COND ! !
! ! 18 ! ! PRESS ! !
! ! 19 ! ! FUEL ! !
! DATA ! 20 ! ! FLT/CTL ! !
! ! 21 ! ! DOOR ! !
! ! 22 ! ! BRAKES ! !
! ! 23 ! ! CLR1 ! !
! ! 24 ! ! CLR2 ! !
! ! 25 ! ! SPARE ! !
! ! 26 ! ! L. TEST ! !
! ! 27 ! ! DIM ! !
! ! 28 ! ! SPARE ! !
! ! 29 ! ! SPARE ! !
!---------!---------!-------!------------------!------------------------------!
! SSM ! 30 ! ! 0 ) FW 0 ) FT 1 ) NCD 1 ) NORMAL !
! ! 31 ! ! 0 ) 1 ) 0 ) 1 ) !
!---------!---------!-------!-------------------------------------------------!
! PARITY ! 32 ! ! !
-------------------------------------------------------------------------------

D. LABEL 155 - Self Test Results
-------------------------------------------------------------------------------
! TITLE ! BIT No. ! VALUE ! MEANING !
!---------!---------!-------!-------------------------------------------------!
! ! 1 ! 1 ! !
! ! 2 ! 0 ! 155 : SELF TEST RESULTS !
! ! 3 ! 1 ! !
! LABEL ! 4 ! 0 ! !
! ! 5 ! 1 ! !
! ! 6 ! 1 ! !
! ! 7 ! 0 ! !
! ! 8 ! 1 ! !
!---------!---------!-------!-------------------------------------------------!
! ! 9 ! ! 0 ) !
! SDI ! 10 ! ! ) Channel 2 !
! ! ! ! 1 ) !
!---------!---------!-------!-------------------------------------------------!
! ! 11 ! ! Static or dynamic ROM failure !
! ! 12 ! ! Static or dynamic RAM failure !
! ! 13 ! ! Discrete acquisition failure !
! ! 14 ! ! Light supply failure !
! ! 15 ! ! Spare !
! ! 16 ! ! CPU2 supply failure !
! ! 17 ! ! ARINC channel 1 refresh failure !
! ! 18 ! ! ARINC channel 2 refresh failure !
! ! 19 ! ! Spare !
! DATA ! 20 ! ! Spare !
! ! 21 ! ! Level 1 ARINC acquisition failure !
! ! 22 ! ! Level 2 ARINC acquisition failure !
! ! 23 ! ! Spare !
! ! 24 ! ! Spare !
! ! 25 ! ! Watchdog failure !
! ! 26 ! ! Spare !
! ! 27 ! ! Spare !
! ! 28 ! ! IRQ failure !
! ! 29 ! ! NMI failure !
!---------!---------!-------!-------------------------------------------------!
! SSM ! 30 ! ! 0 ) FW 0 ) FT 1 ) NCD 1 ) NORMAL !
! ! 31 ! ! 0 ) 1 ) 0 ) 1 ) !
!---------!---------!-------!-------------------------------------------------!
! PARITY ! 32 ! ! !
-------------------------------------------------------------------------------

E. LABEL 156 - Self Test Results
-------------------------------------------------------------------------------
! TITLE ! BIT No. ! VALUE ! MEANING !
!---------!---------!-------!-------------------------------------------------!
! ! 1 ! 1 ! !
! ! 2 ! 0 ! 156 : SELF TEST RESULTS !
! ! 3 ! 1 ! !
! LABEL ! 4 ! 0 ! !
! ! 5 ! 1 ! !
! ! 6 ! 1 ! !
! ! 7 ! 1 ! !
! ! 8 ! 0 ! !
!---------!---------!-------!-------------------------------------------------!
! ! 9 ! ! 0 ) !
! SDI ! 10 ! ! ) Channel 2 !
! ! ! ! 1 ) !
!---------!---------!-------!-------------------------------------------------!
! ! 11 ! ! RTA transmission failure !
! ! 12 ! ! SWI inadvertent failure !
! ! 13 ! ! dynamic ROM failure !
! ! 14 ! ! dynamic RAM failure !
! ! 15 ! ! dynamic watchdog failure !
! ! 16 ! ! ) !
! ! 17 ! ! ) !
! ! 18 ! ! ) !
! ! 19 ! ! ) !
! DATA ! 20 ! ! ) !
! ! 21 ! ! ) !
! ! 22 ! ! ) !
! ! 23 ! ! ) SPARE !
! ! 24 ! ! ) !
! ! 25 ! ! ) !
! ! 26 ! ! ) !
! ! 27 ! ! ) !
! ! 28 ! ! ) !
! ! 29 ! ! ) !
!---------!---------!-------!-------------------------------------------------!
! SSM ! 30 ! ! 0 ) FW 0 ) FT 1 ) NCD 1 ) NORMAL !
! ! 31 ! ! 0 ) 1 ) 0 ) 1 ) !
!---------!---------!-------!-------------------------------------------------!
! PARITY ! 32 ! ! !
-------------------------------------------------------------------------------

F. LABEL 160 - P/N Hardware
-------------------------------------------------------------------------------
! TITLE ! BIT No. ! VALUE ! MEANING !
!---------!---------!-------!-------------------------------------------------!
! ! 1 ! 1 ! !
! ! 2 ! 0 ! 160 : P/N HARDWARE !
! ! 3 ! 1 ! !
! LABEL ! 4 ! 1 ! !
! ! 5 ! 0 ! !
! ! 6 ! 0 ! !
! ! 7 ! 0 ! !
! ! 8 ! 0 ! !
!---------!---------!-------!-------------------------------------------------!
! ! 9 ! 1 ! !
! ! 10 ! 0 ! !
! ! 11 ! 0 ! !
! ! 12 ! 0 ! !
! ! 13 ! 0 ! !
! ! 14 ! 0 ! !
! ! 15 ! 0 ! !
! ! 16 ! 0 ! !
! ! 17 ! 0 ! !
! ! 18 ! 0 ! !
! DATA ! 19 ! 0 ! P/N HARDWARE : 1001 !
! ! 20 ! 0 ! !
! ! 21 ! 1 ! !
! ! 22 ! 0 ! !
! ! 23 ! 0 ! !
! ! 24 ! 0 ! !
! ! 25 ! 0 ! !
! ! 26 ! 0 ! !
! ! 27 ! 0 ! !
! ! 28 ! 0 ! !
! ! 29 ! 0 ! !
!---------!---------!-------!-------------------------------------------------!
! SSM ! 30 ! ! 0 ) FW 0 ) FT 1 ) NCD 1 ) NORMAL !
! ! 31 ! ! 0 ) 1 ) 0 ) 1 ) !
!---------!---------!-------!-------------------------------------------------!
! PARITY ! 32 ! ! !
-------------------------------------------------------------------------------

G. LABEL 161 - P/N Software
-------------------------------------------------------------------------------
! TITLE ! BIT No. ! VALUE ! MEANING !
!---------!---------!-------!-------------------------------------------------!
! ! 1 ! 1 ! !
! ! 2 ! 0 ! 161 : P/N SOFTWARE !
! ! 3 ! 1 ! !
! LABEL ! 4 ! 1 ! !
! ! 5 ! 0 ! !
! ! 6 ! 0 ! !
! ! 7 ! 0 ! !
! ! 8 ! 1 ! !
!---------!---------!-------!-------------------------------------------------!
! ! 9 ! 1 ! !
! ! 10 ! 0 ! !
! ! 11 ! 1 ! !
! ! 12 ! 1 ! !
! ! 13 ! 0 ! !
! ! 14 ! 0 ! !
! ! 15 ! 0 ! !
! ! 16 ! 0 ! !
! ! 17 ! 0 ! !
! ! 18 ! 0 ! !
! DATA ! 19 ! 0 ! P/N SOFTWARE : 13 !
! ! 20 ! 0 ! !
! ! 21 ! 0 ! !
! ! 22 ! 0 ! !
! ! 23 ! 0 ! !
! ! 24 ! 0 ! !
! ! 25 ! 0 ! !
! ! 26 ! 0 ! !
! ! 27 ! 0 ! !
! ! 28 ! 0 ! !
! ! 29 ! 0 ! !
!---------!---------!-------!-------------------------------------------------!
! SSM ! 30 ! ! 0 ) FW 0 ) FT 1 ) NCD 1 ) NORMAL !
! ! 31 ! ! 0 ) 1 ) 0 ) 1 ) !
!---------!---------!-------!-------------------------------------------------!
! PARITY ! 32 ! ! !
-------------------------------------------------------------------------------

H. LABEL 275 - Order of Light Illumination
-------------------------------------------------------------------------------
! TITLE ! BIT No. ! VALUE ! MEANING !
!---------!---------!-------!-------------------------------------------------!
! ! 1 ! ! !
! ! 2 ! ! 275 : LIGHT STATUS !
! ! 3 ! ! !
! LABEL ! 4 ! ! Refresh rate 250 ms !
! ! 5 ! ! !
! ! 6 ! ! !
! ! 7 ! ! !
! ! 8 ! ! !
!---------!---------!-------!-------------------------------------------------!
! ! 9 ! ! DMC 1 ( 1 DMC 2 ( 0 DMC 3 ( 1 !
! SDI ! 10 ! ! ( 0 ( 1 ( 1 !
!---------!---------!-------!-------------------------------------------------!
! ! 11 ! ! SPARE !
! ! 12 ! ! ENG !
! ! 13 ! ! BLEED !
! ! 14 ! ! PRESS !
! ! 15 ! ! HYD !
! ! 16 ! ! ELEC !
! ! 17 ! ! FUEL !
! ! 18 ! ! APU !
! ! 19 ! ! COND !
! DATA ! 20 ! ! DOOR BIT 1 : LIGHT ON !
! ! 21 ! ! F/CTL !
! ! 22 ! ! WHEEL !
! ! 23 ! ! SPARE !
! ! 24 ! ! SPARE !
! ! 25 ! ! SPARE !
! ! 26 ! ! STS !
! ! 27 ! ! CLR !
! ! 28 ! ! SPARE !
! ! 29 ! ! SPARE !
!---------!---------!-------!-------------------------------------------------!
! SSM ! 30 ! ! 0 ) FW 0 ) FT 1 ) NCD 1 ) NORMAL !
! ! 31 ! ! 0 ) 1 ) 0 ) 1 ) !
!---------!---------!-------!-------------------------------------------------!
! PARITY ! 32 ! ! !
-------------------------------------------------------------------------------

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