National Instruments SCXI-1163 - Manual (Page 26)

Chapter 2 Configuration and Installation
© National Instruments Corporation 2-11 SCXI-1163 User Manual
Pin Signal Name Description (continued)
A1, B1, A2, Out<28..31> Port 7 outputs
B2
C2 GND Port 7 ground
C1 Vcc Port 7 power
The SCXI-1163 consists of eight ports of four optically isolated digital outputs. Each port of
outputs has a separate connection for a +5 V power supply (Vcc) and for a ground (GND) for
that port. Digital logic powered by the port Vccs and referenced to the port grounds drives the
outputs of each port; therefore, for any port of outputs to work, you must connect a Vcc and a
ground to that particular port. The outputs work on a +5 V supply (in other words, Vcc must be
5 V above ground for any given port), and supply voltages of 7 V or more may damage the
output circuitry. It is recommended you keep the Vcc between 4.5 and 5.5 V above ground. The
Vcc, ground, and four outputs of one port are isolated from the Vcc, ground, and four outputs of
any 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 earth
ground and to signals of other ports. There is no isolation barrier between signals of the same
port. The signal-to-ground and port-to-port breakdown voltage is 1,900 Vrms.
Terminal Block
To connect the signals to the SCXI-1163 outputs, you can use a National Instruments terminal
block with screw terminals for easy connection.
The terminal block kit is listed in the Optional Equipment section in Chapter 1, Introduction .
SCXI-1326 Terminal Block
The SCXI-1326 front terminal block consists of a shielded board with supports to connect it to
the SCXI-1163 front connector. Forty-eight screw terminals are available for easy signal
connection.
When connecting your signals to the SCXI-1326 for use with the SCXI-1163, you should follow
the 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 ground
to the strain relief tab. This complies with UL 1244 and fully protects against
electric shock when the terminal block is not connected to the chassis. To connect
the safety earth ground to the strain relief tab, run an earth ground wire in the
cable from the signal source to the terminal block. National Instruments is not
liable for any damages or injuries resulting from inadequate safety earth ground
connections.