National Instruments NI 6520 User Manual

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National Instruments NI 6520 User Manual Manual pdf 1 page image

USER GUIDENI 6520/6521This document describes how to use the National Instruments 6520 and6521 data acquisition (DAQ) devices with NI-DAQ 7.5 or later. Devicespecifications can be found on ni.com/manuals. If you have not alreadyinstalled the DAQ device, refer to the DAQ Getting Started Guide forinstallation instructions.The NI 6520/6521 contains five Form A single-pole single-throw (SPST)non-latching relay outputs, three Form C single-pole double-throw (SPDT)non-latching relay outputs, and eight channel-to-channel isolated industrialinputs. The relay’s maximum switching power is 60 W/60 VA. Themaximum switching voltage for the NI 6520 is 30 Vrms/42.4 V pk/60 VDC. The maximum switching voltage for the NI 6521 is150 VDC/VAC.The NI 6520/6521 uses positive logic. A digital high energizes the relay,and a digital low deenergizes it. In the energized state, the common (COM)contact is connected to the normally open (NO) contact. For Form C relaysin the deenergized state, the common contact is connected to the normallyclosed (NC) contact. For Form A relays in the deenergized state, thecommon contact is not connected to the normally open (NO) contact. Whenthe board (PC) is powered off, the relays are deenergized.Caution (NI 6521 Only) This 150 V Measurement Category II module features 1,400 Vrmsisolation between I/O channels and the backplane, as verified by a dielectric withstand test,5 s maximum. For more information on hazardous voltage requirements and safetyinformation for the NI 6521, refer to the NI 6521 Isolation Voltages section.ContentsConfiguration .......................................................................................... 2Functional Overview............................................................................... 3Safety Information .................................................................................. 4Related Documentation........................................................................... 6Features ................................................................................................... 6Digital Filtering................................................................................ 6