_______________________________________________________________________________ | TYPE | NAME | SOURCE | |__________|___________|______________________________________________________| | HS | DGI 1 | Associated Unit | | | DGI 2 | IRS | | | DGI 3 | IRS | | | DGI 4 | Provision | |__________|___________|______________________________________________________| | LS | DGI 5 | Provision | | | DGI 6 | ADC | | | DGI 7 | ADC | | | DGI 8 | Provision | | | DGI 9 | ELAC 1 | | | DGI 10 | FCDC | | | DGI 11 | ELAC 2 | | | DGI 12 | SFCC | | | DGI 13 | Associated Unit | | | DGI 14 | LGCIU | | | DGI 15 | Provision | | | DGI 16 | FTI (signal generator) | | | DGI 17 | Provision | |__________|___________|______________________________________________________|
 -ARINC signals from the various systems (IRS, ADC, SFCC) and from the opposite channel (DGI 1). The ARINC signals acquisition is processed in accordance with (Ref. Fig. 032) The ARINC board receives 16 ARINC buses and achieves the operations necessary to write the ARINC word into a common RAM. The Central Processing Unit reads the ARINC word in the common RAM. The ARINC receiver circuits monitor the no-refresh of the ARINC buses.
 -
The discrete inputs indicate the status of the aircraft. There are two types of discrete inputs state 1 = open state 0 = ground. state 1 = 28 volts state 0 = open or ground. The discrete inputs are processed by the main processor in compliance with (Ref. Fig. 033) The adaptation circuit converts the 28V/OPEN or GND/OPEN input levels into 0-5V levels. The multiplexer circuit selects one input out of 32 and sends it via the data bus (D15). In the COM channel, the servo loop processor acquires 16 additional ground/open discretes.

 -
The control current monitorings (ANI 5) are processed in accordance with (Ref. Fig. 034) The amplifier sends the control current signal to the multiplexer. The multiplexer selects one signal out of seven according to the selected input. After an adaptation, the ADC circuit converts this signal and sends it on the data bus of the servo loop board.

 (2)
 Control law computation The deflection commands are processed in accordance with (Ref. Fig. 035) The control laws are programmed in the memory module and the data inputs are used by the central unit to compute the surface deflection orders. These deflection orders are sent to the servo loop processor. The different control laws are explained in 27-90.

 (3)
 Servo loop processing This function consists in computing the error between the deflection order and the surface position in order to generate a control current for the servo valves or the THS motors. The servo loop is processed in accordance with (Ref. Fig. 036) The control current is generated as follows :

 -the servo loop board receives the surface deflection order epsilon from the CPU 186 board and computes the digital encoding value Qd of the surface position.
 -by software, computation of digital current value Id
 -transfer of digital value Id to the SERVO DRIVE board
 -latching Id to have a constant value during the D/A convertion.
 -Digital/Analog convertion of Id into Ia
 -Ia amplification and generation of control current.

R **ON A/C 001-049, 052-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 (a) spoiler slaving (Ref. Fig. 037, 038) In the COM unit, there are two main functions :
 1 Generation of the servo valve current from the order and
_
 position feedback.

 ARINC Acquisition
 Figure 032

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 Discrete Inputs
 Figure 033
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 Control Current Monitoring
 Figure 034
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 Control Law Computation
 Figure 035
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 Control Surface Servo Loop
 Figure 036
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 Spoiler Y - Slaving and Monitoring
 Figure 037

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 Spoiler X - Slaving and Monitoring
 Figure 038

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