National Instruments SCXI-1163 User Manual

Also see for SCXI-1163: Getting started Instructions for safe use

Contents

National Instruments SCXI-1163 User Manual Manual pdf 26 page image

Chapter 2 Configuration and Installation© National Instruments Corporation 2-11 SCXI-1163 User ManualPin Signal Name Description (continued)A1, B1, A2, Out<28..31> Port 7 outputsB2C2 GND Port 7 groundC1 Vcc Port 7 powerThe SCXI-1163 consists of eight ports of four optically isolated digital outputs. Each port ofoutputs has a separate connection for a +5 V power supply (Vcc) and for a ground (GND) forthat port. Digital logic powered by the port Vccs and referenced to the port grounds drives theoutputs of each port; therefore, for any port of outputs to work, you must connect a Vcc and aground to that particular port. The outputs work on a +5 V supply (in other words, Vcc must be5 V above ground for any given port), and supply voltages of 7 V or more may damage theoutput circuitry. It is recommended you keep the Vcc between 4.5 and 5.5 V above ground. TheVcc, ground, and four outputs of one port are isolated from the Vcc, ground, and four outputs ofany other port, as well as from the internal circuitry of the module.All signals have a working isolation voltage of 450 VAC or VDC referenced to chassis earthground and to signals of other ports. There is no isolation barrier between signals of the sameport. The signal-to-ground and port-to-port breakdown voltage is 1,900 Vrms.Terminal BlockTo connect the signals to the SCXI-1163 outputs, you can use a National Instruments terminalblock with screw terminals for easy connection.The terminal block kit is listed in the Optional Equipment section in Chapter 1, Introduction.SCXI-1326 Terminal BlockThe SCXI-1326 front terminal block consists of a shielded board with supports to connect it tothe SCXI-1163 front connector. Forty-eight screw terminals are available for easy signalconnection.When connecting your signals to the SCXI-1326 for use with the SCXI-1163, you should followthe labeling as indicated in Figure 2-3, SCXI-1326 Parts Locator Diagram.The following warnings contain important safety information concerning hazardous voltages.Warnings: If high voltages (≥42 Vrms) are present, you must connect the safety earth groundto the strain relief tab. This complies with UL 1244 and fully protects againstelectric shock when the terminal block is not connected to the chassis. To connectthe safety earth ground to the strain relief tab, run an earth ground wire in thecable from the signal source to the terminal block. National Instruments is notliable for any damages or injuries resulting from inadequate safety earth groundconnections.