National Instruments cRIO-9068 User Manual

Also see for cRIO-9068: Getting started guide

Contents

National Instruments cRIO-9068 User Manual Manual pdf 13 page image

Figure 5. cRIO-9068 Grounding Screw11. Grounding ScrewFor EMC compliance, you must connect the cRIO-9068 to earth ground through the chassisground screw. Use wire that is 2.0 mm2 (14 AWG) solid copper wire with a maximum lengthof 1.5 m (5 ft). Attach the wire to the earth ground of the electrode system of the facility.Caution If you use shielded cabling to connect to a C Series module with a plasticconnector, you must attach the cable shield to the chassis grounding terminal using2.0 mm2 (14 AWG) or larger wire. Attach a ring lug to the wire and attach the wireto the chassis grounding terminal. Solder the other end of the wire to the cableshield. Use shorter wire for better EMC performance.For more information about ground connections, visit ni.com/info and enter the Info Codeemcground.Internal Real-Time ClockThe cRIO-9068 contains an internal real-time clock that maintains system time when thecRIO-9068 is powered off. The system clock of the cRIO-9068 is synchronized with theinternal real-time clock at startup. You can set the real-time clock using MAX, or you can setthe clock programmatically using LabVIEW.Refer to the specifications on ni.com/manuals for the real-time clock accuracy specifications.BatteryThe cRIO-9068 contains a lithium cell battery that stores the system clock information whenthe cRIO-9068 is powered off. There is only a slight drain on the battery when power isapplied to the cRIO-9068 power connector. The rate at which the battery drains when power isdisconnected depends on the ambient storage temperature. For longer battery life, store thecRIO-9068 at a cooler temperature and apply power to the power connector. Refer to thespecifications on ni.com/manuals for the expected battery lifetime.The battery is not user-replaceable. If you need to replace the battery, contact NI. Refer to thespecifications on ni.com/manuals for information about battery disposal.File SystemLabVIEW mounts USB devices to the media/sdx1 directory and creates symboliclinks /u, /v, /w, or /x to the media mount point, starting with /u if it is available. To preventany file corruption to external storage devices, verify that any file IO operations with theNI cRIO-9068 User Manual | © National Instruments | 13