ADLINK PXI-7921 - Manual (Page 33)

Operation Theorem • 27
4.7 Hot-Swap
The Switch Module can be hot-swapped during hardware failure in non-
interruptible or high-availability systems where system shutdown is not an
option.
PXI-7921 incorporates an onboard hot-swap control mechanism. However the
extent of the hot-swap functionality support depends on the operating system
and the PXI platform.
Microsoft Embedded XP
®
supports the native hot-swap function. The operating
system automatically releases system resources when a switch module is
extracted and recognizes the new device.
To remove a switch module, first release the screws on the front panel then
push down the red latch on the ejector. When the blue LED turns on, the Switch
module is ready to be removed by fully pushing down the ejector.
To insert another switch module, align the module’s edge with the card guide in
the PXI chassis. Slide the switch module into the chassis, until there is
resistance from the PXI connector. Push the ejector up and fully insert the
switch module into the chassis, a click should be heard from the ejector latch.
The blue LED on the front panel of the switch module will switch off when it is
ready for operation. Tighten the screws on the front panel.
Note: Microsoft Windows 2000
®
does not natively support hot-swap however,
PXI-7921 can be hot-swapped by manual control via an additional hot-swap
driver. For the hot-swap driver on Windows 2000 and other operating systems
such as Linux, VxWorks, etc., please contact ADLINK for more information.
4.8 Emergency Shutdown
In safety-critical applications, users can enable the emergency shutdown
function on PXI Switch Module, to manually set the relay pattern to preset state.
To access this function, users must first configure the emergency shutdown
function by windows API. Generally the trigger source is on the front panel and
connected to a push button, which pulls the SHDNn pin to logic-low when
activated. When multiple PXI Switch modules are installed in a PXI chassis, the
trigger source can be routed through the PXI Trigger Bus and eliminate field
wiring across multiple devices. Figure 12 illustrates available trigger sources for
emergency shutdown. Signal names in the solid-line boxes represent the
external (physical) signal on connectors and signals in the dotted-line boxes
represent the switch module’s internal signal.