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Getting Started
Option 01 VXI Interface Module User Manual
1–3
VXI interface &
slave controller
daughter board
VXI backplane
local bus
Backplane
connectors
Daughter board
connectors
Front panel
connectors
Figure 1–2: Typical SurePath Configuration
Each relay module that the Option 01 Module controls has a fuse that limits the
amount of current that the module can draw from the VXI backplane +5 V power
pins. This fuse protects the module in case of an accidental shorting of the power
bus or any other situation where excessive current might be drawn.
The Option 01 Module monitors the state of the fuses of each of the relay
modules that it controls. If a fuse opens on one of these modules, the Option 01
Module will assert SYSFAIL* on the VXIbus.
If the +5 V fuse on the module on which the Option 01 Module is installed
opens, the VXIbus Resource Manager will be unable to assert SYSFAIL
INHIBIT on the Option 01 to disable SYSFAIL*.
If a +5 V fuse opens, remove the fault before replacing the fuse. Replacement
fuse information is given in the Specifications section of the user manual for the
appropriate relay module.
Built-in Test Equipment (BITE) is provided by extensive self tests that are
automatically invoked on power-on and can also be invoked on command.
Circuitry tested includes the CPU and all memory
, and the relay control circuitry
on each relay module controlled by the Option 01.
Fuses
BITE (Built-in Test
Equipment)