Appendix B
5B Series Module Data Sheets
©
National Instruments Corporation
B-39
SC-2311 User Manual
The module protects the computer side from damage due to field-side overvoltage faults.
The module withstands 240 V rms at the input terminals without damage, thereby shielding
the internal computer-side circuitry from field-side overvoltage conditions. In addition, the
5B42 is mix-and-match and hot-swappable with all other 5B Series modules, so can be
inserted or removed from any socket in the same
backplane
without disrupting system
power.
Convenience Features
A series output switch eliminates the need for external multiplexing in many applications.
The switch is turned on by an active-low enable input. If the switch is to be on at all times,
the enable-input should be grounded to output common as it is on the 5B01 and 5B08
backplanes
.
Figure 1. 5B42 Functional Block Diagram
Input Types
Two-Wire Transmitters 4 to 20 mA
(0 to 20 mA - custom)
Output Range
+1 to +5 V or +2 to +10 V
(0 to +10 V - custom)
Figure 2. 5B42 Input Field Connections
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