(b)
 Analog AC signals from the various control surface position transducers of the inductive pick-off type (ANI 2, ANI 3, ANI 7). The ENGAGE LOGIC board receives these signals from inductive transducers and generated VR=V1-V2 and VX=V1+V2 signals (Ref. Fig. 030)

 NOTE : For ANI 3 and ANI 7, VR is the potentiometer supply.

____

 The CONTROL LOOP board receives each VR and VX representative of
 a transducer position.
 The various input channels are processed sequentially.
 The sequence is controlled by the Central Processing Unit.

 Potentiometer Signal Acquisition
 Figure 029
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 ANI 2 Input
 Figure 030
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 The conversion program cycle is shown below :
 -selection of the analog input and loading of the DAC multiplier with QD (QD is the digital conversion of the analog input).
 -computation of the analog error epsilon = VX - QD VR

 -integration of the error epsilon during a period

 -discharge of integrator output until zero crossing detection

 -measurement of the discharge time.
 This time is representative of epsilon and is sent to the servo
 loop processing which computes a new Qd for a new conversion
 cycle.

 NOTE : A phase reference detection is achieved to select epsilon
____ or epsilon at the integrator input.
 -Tachometer generator acquisition The analog AC input from the tachometer generator is processed in accordance with (Ref. Fig. 031) The input signal has variable frequency (up to 4500 Hz) and voltage (30V peak to peak). After adaptation, a square wave signal with the same frequency is obtained. The controller manages a 16-bit counter which determines the number of clock periods within one period of the input signal. It also transfers the counter output to the buffer. This number of clock periods represents the wheel speed. The clock frequency (375KHz) is obtained by dividing the clock integrated on the microprocessor 80186. -Analog Inputs
 _______________________________________________________________________________ | TYPE | ANI | ORIGIN | NUMBER | | | NAME | | COM | MON | |____________________|___________|____________________________________________| |Center-point | 1-1 |CAPT ELEV Command | 7 | 7 | |potentiometer | 1-2 |F/O ELEV Command | | | | | 1-3 |CAPT AIL Command | | | | | 1-4 |F/O AIL Command | | | | | 1-5 |SPD BRK CTL Lever Pos | | | | | 1-6 |L throttle CTL Lever Pos | | | | | 1-7 |R throttle CTL Lever Pos | | | |--------------------|-----------|------------------------------|------|------| |Inductive | 2-1 |L ELEV POS (RVDT) | 7 | 7 | |transducers | 2-2 |R ELEV POS (RVDT) | | | |(SM) with 2 offset | 2-3 |THS POS (RVDT) | | | |secondaries | 2-4 |L SPLR X POS (LVDT) | | | |(RVDT-LVDT) | 2-5 |R SPLR X POS (LVDT) | | |

 Tachometer Generator Acquisition
 Figure 031
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 _______________________________________________________________________________ | TYPE | ANI | ORIGIN | NUMBER | | | NAME | | COM | MON | |____________________|___________|____________________________________________| | | 2-6 |L SPLR Y POS (LVDT) | | | | | 2-7 |R SPLR Y POS (LVDT) | | | |____________________|___________|______________________________|______|______| |Inductive | 3-1 |L ELEV SV slide valve (LVDT) | | 2 | |transducers | 3-2 |R ELEV SV slide valve (RVDT) | | | |(SV) with one | | | | | |secondary (LVDT) | | | | | |____________________|___________|______________________________|______|______| |Low-impedance | 4-1 |Vertical acceleration X | 3 | 3 | |DC signals | 4-2 |Vertical acceleration Y | (+2) | (+2) | |(accelerometer) | 4-3 |Test | | | | | 4-4 |Provision | | | | | 4-5 |Provision | | | |____________________|___________|______________________________|______|______| |Analog output | 5-1 |L ELEV SV current | 7 | | |internal | 5-2 |R ELEV SV current | | | |wraparound | 5-3 |THS SV current | | | |(current) | 5-4 |L SPLR X SV current | | | | | 5-5 |R SPLR X SV current | | | | | 5-6 |L SPLR Y SV current | | | | | 5-7 |R SPLR Y SV current | | | |____________________|___________|______________________________|______|______| |Tachometer | 6-1 |Main wheel speed | 1 | 1 | |generator | | | | | |____________________|___________|______________________________|______|______| |Inductive | 7-1 |L ELEV mode change slide valve| | 2 | |Transducer | |POS | | | |(LVDT with one | 7-2 |R ELEV mode change slide valve| | | |secondary) | |POS | | | |____________________|___________|______________________________|______|______|
　
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