Universal system for harnesses testing


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I/O Subsystems -

I/O subsystem modules

The physical connection between
the test table and the harness
to be tested is made by means
of I/O subsystem modules.
The I/O subsystem operates in a distributed way, and does not need any customization of the boards (automatic addresses recognition).

The interconnection of all modules is demanded to a distributed Bus.
The I/O modules are then installed where necessary, allowing a direct connection to the terminal boards and headers modules, avoiding the need to lay down the 64 wires flat cables.

 The following modules are part of an I/O subsystem
64 I/O - ST 309A Board
It is interfaced on the I/O Bus and generates
locally 64 I/O, made available on the DIN 41612 interface.

Each single I/O is a bi-directional open collector type.
It is supplied by a 12Vdc line (max. 18Vdc)
with 120 mA max. driving capability.
The I/O can be used as:

General-purpose I/O
They can drive, for example, relays, shuttles and signaling lamps, they can read pushbuttons statuses and positions, all external to Autoblocks.
Cable test I/O, such as: continuity, short circuits, unbalancing detection.
LEDs' driving I/O.
Additional controls on Autoblocks I/O,
(leakage test, clips presence, S.L. presence, etc.)

Interface boards
Directly plugged int othe DIN 41612
connector of the I/O module, actiuating the physical connection of the peripherals to the I/O module.
The available standards are:

Autoblock - ST 324 interface module
It allows the easy and quick connection between
the test equipment and the adapters,
being in the Autoblock standard, thanks
to a double connector interface.
Interface module with terminal boards type ST 315.
Useful for general purpose needs.
Optical fibers interface module.
. The subsystem
Is obviously equipped with mechanical supports, connection cables, and
power supplies. Further technical details can be found in the relevant technical data sheet .

At each I/O subsystem channel
can be connected 32 I/O modules maximum, thus giving a 2048 lines connection capability each.
 		It is deeply used in those applications where
the operator has to be directly driven in all the operations relevant to the cable composition (mounting and testing tables)

 The following table shows
the maximum possible configurations:
Tester
Internal channels #
External channels #
Internal I/OMax #
External I/OMax #
Uni2
-
2
-
4.096
Uni3
1
1
512
2.048
Uni4
-
4
-
8.192
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