National Instruments NI 781xR User Manual

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National Instruments NI 781xR User Manual Manual pdf 12 page image

Chapter 1 Introduction© National Instruments Corporation 1-3 NI 781xR User ManualOverview of Reconfigurable I/OThis section explains reconfigurable I/O and describes how to use theLabVIEW FPGA Module to build high-level functions in hardware.Refer to Chapter 2, Hardware Overview of the NI 781xR, for descriptionsof the I/O resources on the NI 781xR.Reconfigurable I/O ConceptThe NI 781xR is based on a reconfigurable FPGA core surrounded by fixeddigital input and output resources. You can configure the behavior of theFPGA to meet the requirements of your measurement and control system.You can implement this user-defined behavior as an FPGA VI to create anapplication-specific I/O device.Flexible FunctionalityFlexible functionality allows the NI 781xR to match individual applicationrequirements and to mimic the functionality of fixed I/O devices. Forexample, you can configure an R Series device in one application for three32-bit quadrature encoders and then reconfigure the R Series device inanother application for eight 16-bit event counters.You also can use the R Series device with the LabVIEW Real-TimeModule in timing and triggering applications, such as control andhardware-in-the-loop (HIL) simulations. For example, you can configurethe R Series device for a single timed loop in one application and thenTable 1-1. Pins Used by the NI PXI-781xRNI PXI-781xR Signal PXI Pin Name PXI J2 Pin NumberPXI Trigger<0..7> PXI Trigger<0..7> A16, A17, A18, B16, B18, C18,E16, E18PXI Clock 10 MHz PXI Clock 10 MHz E17PXI Star Trigger PXI Star Trigger D17LBLSTAR<0..12> LBL<0..12> A1, A19, C1, C19, C20, D1, D2,D15, D19, E1, E2, E19, E20LBR<0..12> LBR<0..12> A2, A3, A20, A21, B2, B20, C3,C21, D3, D21, E3, E15, E21