(2) Description of the systems 1 and 2 Each system is supplied independently with 115V 400 Hz power and has two channels. Each channel has its own power supply (+ 5V, plus or minus 15V) and acquisition modules.
-
A control channel ensures the slaving functions and produces the currents which are sent to the electro-hydraulic components.
-
A monitoring channel dialogues with the control channel through a serial link and monitors the control channel.
(a)
Control channel
This channel uses the boards below:
-A computation board built around an INTEL 80186 microprocessor which executes all the functional programs and manages the discrete and analog inputs,
-An acquisition board managed by an INTEL 80186 microprocessor, used as an acquisition automaton. The acquired data is shaped and stored in a dual-access memory (computation and acquisition) located on the computation board. It performs the ARINC 429 transmission/reception. Its function is to ensure all the system commands which will be in turn confirmed by the monitoring channel. (Ref. Fig. 038)
(b)
Monitoring channel (Ref. Fig. 039) This channel consists in a single board. It is built around an INTEL 80186 microprocessor. It performs all the acquisitions and computations which enable to monitor the control channel. The monitoring function is ensured by the comparison of the computation results with wraparound of the orders sent by the control channel. It receives the ARINC 429 data. The monitoring board is connected to the control board by a serial link.
(c)
Connection between the two systems (Ref. Fig. 040) The dialogue is through 4 validity discretes (1 for each channel). During the functional test upon the landing gear extension an exchange of the codes sent over 8 discretes enables to test the two systems.
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BSCU - Internal Architecture
Figure 037A
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BSCU - Control Channel
Figure 038
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BSCU - Control Channel - CPU card
Figure 038A
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BSCU - Monitoring Channel
Figure 039
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BSCU - Monitoring Channel - I/O2 card
Figure 039A
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BSCU - Connection Between the SYS1 and SYS2
Figure 040
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(d) Operation At each energization the first system supplied takes control. The exclusion between the two systems is ensured by the software. If the two systems are supplied simultaneously the SYS1 has priority. If there is a disagreement between the control and monitoring channels of the system engaged:
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the system is disconnected, it cancels its validity bits and isolates its commands,
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the system in standby takes over. It validates its commands and ensures again all the functions of the unit with the same level of performance.
(3) Software organization of the BSCU The BSCU is made of two systems physically distinct but functionally identical:
-
System 1,
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System 2.
The unit has two identical software programs (one for each system).
Each system itself has two channels:
-Control,
-Monitoring.
Each system integrates two different software programs (one for each
channel).
-PLM 86 for the monitoring channel.
-Assembler for the control channel.
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-----------------| BSCU Software |
-----------------|
|
------------------------------------------| |
| |
------------------------| SYS1 | | SYS2 |
| Software | | Software |
------------------------| |
| |
-----------------------------------------| | | |
| | | |
-------------------------------------------| Control | | Monitoring| | Control | | Monitoring|
| Channel | | Channel | | Channel | | Channel |
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