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test simulations in a predictable
manner;
➤ Data visualization;
➤ Standard online and offline
analysis tools;
➤ User-definable visualization
components (panels); and
➤ Data exchange interface.
An effective test system should
have online and offline visualization
tools that provide powerful views to
real-time and recorded data. The data
may be analyzed using internal or
external tools, then modified, preprocessed
and reimported to the test
system for data replay. User panels
may be defined in a panel builder to
visualize and change online data, using
various kinds of graphical objects.
By incorporating COTS technology
with a modular design test system,
companies developing new avionics
can save both time and money, as well
as deliver considerable flexibility.
About Tech S.A.T
Tech S.A.T GmbH, near Munich,
designs and produces customer-specific
real-time test and simulation
benches for the development and
integration of avionics control systems,
as well as for maintenance and
end-testing. Over the past 15 years it
has worked with such companies as
Airbus, Boeing, Rockwell Collins,
Parker, MTU, Diehl Avionik, BMW
Rolls Royce and Honeywell.
Tech S.A.T entered the automated
testing field in the early 1990s with its
ATLAS-based test rigs used on A320
avionics controller systems. At about
the same time Boeing contracted
Tech S.A.T and /dev Software GmbH
to develop a real-time bus analyzer
and recording tool (BART), used as an
ARINC 629 and 429 data bus tester
during the integration of B777 systems.
The ATLAS-based rig and BART
evolved into the company’s ADS2-SIB
system integration bench, which has
been completely overhauled to
enhance its flexibility and functionality.
Today Airbus Germany and several
supplier companies employ some 50
ADS-SIBs to integrate and validate
A380 avionics systems.
A COTS Made-to-Measure Test Suite
An example of a modular test system with considerable
commercial off-the-shelf (COTS) components is the
ADS2-SIB (Avionics Development System 2nd Generation-
System Integration Bench) produced by Tech S.A.T
GmbH and /dev Software GmbH, both based in Germany.
Current ADS2-SIB systems use COTS components either
as PC-related I/O (RS232, Ethernet), peripheral component
interconnect (PCI) devices (either PC or PMC), or
mainly VMEbus devices. Execution hosts for the test system
are Motorola MPUs running VxWorks or PCs running
Windows or Linux. Execution hosts can be connected
either via Ethernet, VMEbus or reflective memory
interconnections. Individually running ADS2-SIB systems
can transfer information via Ethernet to form test
clusters. The ADS2-SIB system components include:
➤ Real-time processing and I/O unit (RTIOS), which
holds the system’s real-time database and controls
the real-time I/O.
➤ Wiring matrix (WMx), which gives the system
integration bench (SIB) the capability to relate all
forms of wiring, from the test system’s I/O channels
to the unit under test (UUT).
➤ Signal conditioning unit (SCU), which is designed as a
modular plug-in card system mounted in a 3U or 6U
card cage, or combination of both. The SCU, used for
signal adjustment, can also accommodate sensor and
actuator simulations or their real counterparts, if
needed by the UUT. The real devices also are
connected to the wiring matrix.
➤ Switch unit, which is part of the WMx and is used if
the SIB contains both simulated and real devices. It
switches the WMx from device simulation to real
device operation, and vice versa.
➤ And the fault insertion and breakout (FIBO) unit,
which is optional. The FIBO is used for error injection,
monitoring and self-test purposes of
avionics test and simulation systems
that require both manual and automatic
access to each signal line connecting
the test system with the UUT.
It offers both a modular breakout
panel and software-controlled error
injection functions, which include
signal line interruption, transfer
resistance, resistance to ground,
short circuit to ground, resistance
between two signal lines, and short
circuit between two signal lines. The
FIBO supports standard signals (DC
35 volts/2 amps or AC 125 volts/0.5
amp) and power signals (up to AC/DC
250 volts/8 amps), and it provides
connections to the external measurement
and stimulation devices, such
as digital multimeter (DMM), frequency
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