-
a 1 Mbyte flash EPROM
-
a 512 Kbyte RAM
The I/O2 board ensures:
-DSI (discrete inputs) acquisitions,
-ANI (analog inputs) acquisitions,
-DGI (digital inputs) acquisitions,
-DSO (discrete outputs) generations,
-ANO (analog outputs) generations,
-Power supply (5V plus or minus 15V) monitoring
-Switching controls.
(c)
Connection between the two systems 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.
(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:
-
the system is disconnected, it cancels its validity bits and isolates its commands,
-
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.
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BSCU - Monitoring Channel - I/02 card
Figure 031
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(3) Software organization of the BSCU The BSCU is made of two systems physically distinct but functionally identical:
-
System 1,
-
System 2.
The unit has two identical software programs (one for each system).
Each system itself has two channels:
-Control,
-Monitoring.
(a) Software architecture
The software is divided into two parts:
- operational software,
-workshop maintenance software.
Operational software
The operational software includes:
-
the functional software,
-
the test software,
-
the monitoring and test software.
The functional software (braking control, anti-skid, ARINC 429
management...) and the test software are integrated in the
control channel.
The monitoring software is integrated in the monitoring channel.
The operational software is divided into modules as per the IDEFO
method (ICAM Definition Method). The corresponding diagrams are
given in the figures below:
(Ref. Fig. 032, 033, 034, 035, 036, 037, 038, 039, 040)
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BSCU Operational Software
Figure 032
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BSCU Operational Software
Figure 033
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BSCU Operational Software
Figure 034
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BSCU Operational Software
Figure 035
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BSCU Operational Software
Figure 036
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BSCU Operational Software
Figure 037
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BSCU Operational Software
Figure 038
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BSCU Operational Software
Figure 039
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BSCU Operational Software
Figure 040
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7. Operation/Control and Indicating________________________________
A. Manual Braking
(Ref. Fig. 041, 042)
Manual braking is available when the Green hydraulic pressure is more
than 150 bar (2176 psi) and one of these conditions occur:
-
the left MLG or the right MLG is on the ground
-
the average computed wheel speed is more than a specified value
-
the ground speed (from the ADIRS) is less than a specified value.
The operation of the brake pedal(s) causes the control lever(s) of the brake pedal transmitter unit (at the first officers position) to turn. The control lever(s) turns its related potentiometer which gives an electrical output to the BSCU. This output is in proportion to the angle through which the pedal(s) turn.
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