Rockwell Automation 1771-IS 5V DC INPUT MOD - Manual (Page 4)

Chapter
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Introduction
The 1771-IS DC (5V) Multiplexer Input Module, Figure 1.1 reads the
status of up to 72 hard contact switch devices through one I/O slot. This
information is transferred to the PC processor by block transfer
programming. The module can be used with any Allen-Bradley
programmable controller that has block transfer capability, an expandable
data table, and uses the 1771-I/O structure.
Figure 1.1
DC (5V) Multiplexer Input Module
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When thumbwheel switches are used with the module, user-selectable
operating modes can be selected for convenient storage of 3-digit and
4-digit BCD thumbwheel data. An additional mode is provided that
latches the input of momentary contact devices such as pushbutton or
keyboard switches.
The module performs self diagnostics during its initial power-up
sequence. If a memory failure is detected at any time, the fault LED on
the front panel will illuminate and the module will not operate.
General