©
National Instruments Corporation
7
TBX-1303 32-Channel Isothermal Terminal Block
Connecting Signals
Caution
Do
not
connect hazardous voltage levels (
≥
42 V) to this product.
To connect field signals to the TBX-1303 for use with the SCXI-1100
or SCXI-1102/B/C module, refer to Figures 2 and 4 as you complete the
following steps.
1.
Unscrew the four captive cover screws in the corners of the TBX-1303
terminal block and remove the cover.
2.
Connect the signal wires to the screw terminals. Refer to the SCXI
module user manual for examples of how to connect to field signals
and loads. Route the signal wires through the signal wire entry, shown
in Figure 2.
Note
The GND terminals are connected to the SCXI module chassis ground through the
cable, not the shield. In addition, each channel has its own shield terminal (labeled
S
on the
board) for connecting signal shields. The TBX-1303 has corresponding rows labeled
A
,
B
,
and
C
, as shown in Figure 4, to help you make the correct connections.
3.
Verify that you have the resistor networks appropriate to the SCXI
module, signal type, and application. Refer to Table 4 for information
about selecting the appropriate resistor networks.
4.
Replace the TBX-1303 terminal block cover and tighten the captive
cover screws.
Note
This terminal block does not provide strain relief for field signal wires. If necessary,
add strain relief, insulation, and padding for the field signal wires.
The installation and signal connection are now complete.