Chapter 3
Feature Set Description
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National Instruments Corporation
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While one or more new I/O modules in a bank are being serviced by the
HotPnP feature, the other I/O modules in the bank remain fully operational
and accessible on the network without any interruptions. As soon as the
FP-1000/1001 configures the new I/O module via the HotPnP service, that
I/O module becomes automatically accessible on the network.
Replacing I/O Modules
When an I/O module is removed, the FP-1000/1001 does not undertake any
special course of action for the bank. The host computer (or the software
executing on it) might be unaware that the I/O module is missing, and could
continue to send commands to the missing I/O module. Each command
returns an error response, but the FP-1000/1001 remembers the commands
sent to the missing I/O module.
When a new I/O module is connected in place of the one that was removed,
the FP-1000/1001 first verifies that the replacement I/O module is
compatible with the one that was removed. If the I/O module is the same
as, or is compatible with, the one removed, the FP-1000/1001 configures
the replacement I/O module with its predecessor’s configuration and output
value settings. It also applies the effects of any commands sent by the host
computer while the I/O module was missing.
If the replacement module is incompatible with the one that was removed,
the FP-1000/1001 looks at the information stored in the SnapShot. If the
SnapShot is enabled and the replacement module is compatible with the
information in the SnapShot, the FP-1000/1001 configures the replacement
module with the SnapShot configuration. Otherwise, the FP-1000/1001
configures the replacement module to factory default settings.
Table 3-1 shows how modules are configured after HotPnP replacement.
