This system is available in two versions, one based on Intel 87C196 CPU and the other with Motorola’s 68332 Micro-Controller. The resources include 88 DIPs, 100 DOPs, 48 Analog Inputs, 12 Analog Outputs, 4 RS-422 channels & one MIL-STD-1553B interface.
Two versions
87C196 Microcontroller based 68332 Microcontroller based.
Interfaces
Digital inputs - 88 Nos. Active (opto isolated), Passive (opto isolated)
Digital outputs - 100 Nos.
Analog inputs - 48 Nos.
Analog outputs - 12 Nos.
MIL-STD-1553B-SERIAL bi-directional communication interface- 1 No.
Point to point serial communication RS-422 - 4 Nos.
Applications
Being used as data acquisition systems for National programmes.
The Stores Interface Box (SIB) is an LRU, which is required to function in a high reliability safety critical environment. Its function is to control a number of other subsystems based on commands received from two open architecture computers over 1553B Buses. The SIB is configured as dual redundant hardware including power supply to enhance the reliability. The SIB is packaged in a ½ Air Transport Rack (ATR) size enclosure with overall dimensions L=355mm, W=124mm, H= 194mm. The SIB consists of 3 PCBs of size 233.35 X 160 mm(6U Double Euro) in the main card cage and a set of 2 smaller PCBs of size 75 mm X160 mm and 65mm X 160mm in the side compartment which houses the ARINC S700 connector.The 3 PCBs in the main card cage plug into a 3 slot VME back-plane with P0, P1 & P2 connectors. The input and output signals to/from the SIB through a combination of Round shell MIL 38999, ARINC S700 Rack & Panel, and tri-axial SMA connectors. In addition set of 34 electro-mechanical relays, DC-DC converter modules and associated RF filters to derive the required operating voltages for the various circuits (+5V and isolated +28V) from the 28VDC input equipment supply also in the Rack.The SIB is dissipate around 40 watt depending on the loading and duty cycle. Weight of the unit is around 10Kg. Applicable standards are MIL-STD-810D and MIL-STD-461.
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Environmental Specifications
Vibration: As per MIL-STD-810D Shock : As per MIL-STD-810D Radiation Susceptibility : As per MIL-STD 461C, 462 & Compatibility. Operating Temperature : -40° to 65° C Storage Temperature : -55° to 85 ° C Damp Heat : As per MIL-STD-810D Electrical Supply Sensitivity: As per MIL-STD-704D
Electrical Specifications :The Power Supply to all the cards in SIB are derived through EMI/EMC 461C compliance Power Filter and DC-DC Converter.
Grounding:The internal Supply returns are terminated to equipment sub-star to which all ground lines (Digital, Analog).The general Grounding, Shielding, Isolation Filter etc., are in accordance with EMI/EMC norms. Bonding Resistance measurement lug is provided on front face of the LRU.Earthing :
Single Point Earthing outside the Box. All the cards are electrically isolated with respect to the Chassis Ground . Resistance to ground > 1M Ohms Insulation between any line and chassis > 1M Ohm
Mechanical Specifications:
Material :Aluminium 6061 avionics grade alloy
Mounting:The Unit does not require any special guide or fixtures for installation and does not have installation location constraints.
Physical:
Size : ½ ATR (L=355mm, W=124mm, H=194mm) Weight (loaded with PCBs ) : 11Kg (Maximum)Thermal Specifications:
Cooling : Conductive Cooling (No Fans) PCBs : Metal-Core
This package is one of the critical avionic packages. The unit receives commands from onboard computer over 1553B bus and is responsible for switching relays, monitoring their status, sending command voltages to control systems, providing excitation supply to pressure transducers, conditioning received signal voltages and measuring parameters like system pressures and battery voltages.
On Board Computer is a ruggedized computer designed to carry out various functions, viz. control, guidance, monitor the health of sub systems. The OBC interacts with Receiver and Telemetry using 1553B bus. In addition OBC also has other interfaces like Discrete Outputs interface and control system interface (Analog I/O).OBC operates on 28 V DC input supply.
The On Board Computer is based on distributed architecture system and real time data exchange is required between various subsystems. OBC is based on ADSP21060 processor. It has two channels of dual redundant MIL-STD-1553B buses.
The ¾ Aviation Transport Rack is a LRU, which is required to function in a highly reliable and safety critical environment. The ¾ ATR is a Ruggedized Mechanical chassis. The basic concepts of focus are the inter-changeability of the LRU, high levels of Thermal Management, easy mode of operation and maintenance.
Unit is based on Intel-80486 CPU operating at 64Mhz speed. It communicates with external units through MIL-STD-1553B Channel. It has 4 MB of Flash and 2 MB of SRAM along with 32 discrete inputs/outputs, three serial RS-422 interfaces, 16 analog inputs & 8 analog outputs, 6 timers, and One RS-232 interface. The system is a self-contained unit and operates with DC input of 28V. The unit has circular connectors on its back panel for external interfaces. The MIL-STD-1553B interface is provided through BJ-77 Connectors. Provision for future growth potential is provided though addition of a mezzanine connector. Additional interfaces can be added through the addition of mezzanine cards for custom-built requirements. State of the art components / technology are used for the design.
