Installing And Configuring The Scxi-1127; Table 1-1. Scxi-1127 Configuration - NI SCXI-1127 User Manual

Installing and Configuring the
SCXI-1127
© National Instruments Corporation
The SCXI-1127 module is a high-voltage multiplexer/matrix module. It is
a high-density armature relay module that provides a 32x1, two-wire
multiplexer and several switch matrix configurations on an SCXI platform.
The SCXI-1127 can also operate as two 16x1 or four 8x1, two-wire
multiplexers allowing a single module to handle several multiplexing
needs.
Through software-configurable switches, the module can also operate as a
one-wire 64x1 multiplexer, enabling you to make a large number of
common referenced measurements. It can also operate as a 16x1, four-wire
multiplexer to make resistive measurements such as those needed for
thermistors and RTDs. With the use of special terminal blocks, the
SCXI-1127 can become an 8x4 or 32x1, two-wire matrix. A complete list
of possible configurations is given in Table 1-1.

Table 1-1. SCXI-1127 Configuration

Scanning
Configuration
One-wire
Two-wire
Four-wire
To handle large channel counts, you can expand the size of the multiplexer
with additional SCXI-1127 modules. These modules support the analog
bus through a special adapter, the high-voltage analog bus (HVAB)
backplane adapter in the SCXI-1357/1358 kit, at the rear of the module.
This adapter allows you to expand the HVAB without complicated wiring.
For example, you can connect two SCXI-1127 modules using the
HVAB-backplane adapter to create a 64x1, two-wire multiplexer.
In a matrix configuration, you can expand the columns of the matrix using
the HVAB-backplane adapter. For example, you can connect two
Multiplexer
64x1
32x1
16x1
1-1
1
Matrix
N/A
8x4 (Also 16x2, 32x1)
N/A
SCXI-1127 User Manual