configuration challenges compared to IEEE 1588-2008. A cRIO-904x controller acts as a
time-aware end station for both protocols.
IEEE 1588 External Switch Requirements
To take advantage of the network synchronization features of the cRIO-904x controllers,
ensure that your network infrastructure meets certain requirements depending on which
IEEE 1588 profile is implemented for your application:
• IEEE 802.1AS-2011 support—Automatically enables timebase synchronization and
enables the use of time-based triggers and timestamping between devices across the
network. Synchronization performance will meet NI product specifications.
• IEEE 1588-2008 support—Enables timebase synchronization and enables the use of time-
based triggers and timestamping between devices across the network. Synchronization
performance will vary and may not meet NI product specifications. As a default
configuration for IEEE 1588-2008, NI supports the IEEE 1588 Delay Request-Response
profile, using the UDP over IP transport (layer 3-4).
CMOS Battery
The cRIO-904x contains a CMOS battery. The CMOS battery is a lithium cell battery that
stores the system clock information when the cRIO-904x is powered off. There is only a slight
drain on the CMOS battery when power is applied to the cRIO-904x power connector. The rate
at which the CMOS battery drains when power is disconnected depends on the ambient
storage temperature. For longer battery life, store the cRIO-904x at a cooler temperature and
apply power to the power connector. Refer to the specifications for your model on ni.com/
manuals for the expected battery lifetime.
The CMOS BATTERY IS DEAD warning appears onscreen during the power-on self test if the
battery is dead. The cRIO-904x still starts, but the system clock is reset to the date and time of
the BIOS release. The battery is not user-replaceable. If you need to replace the CMOS
battery, contact NI. Refer to the specifications for your model on ni.com/manuals for
information about battery disposal.
Installing the Module Immobilization Accessory
The Module Immobilization accessory ensures that the C Series module latches cannot be
retracted and modules cannot be removed from a system. The Module Immobilization
accessory provides extra system assurance and security when shipping and installing systems,
and prevents accidental removal from a system during operation.
When using the Module Immobilization accessory, NI recommends installing the accessory
prior to mounting the system in any enclosure because the accessory requires tool access to the
top, right, and bottom of the cRIO-904x.
What to Use
• cRIO-904x
• C Series modules
22 | ni.com | cRIO-904x User Manual
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