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Chapter 3 System Overview
Plug-in Modules Overview
4
3
Digital I/O Modules
The digital I/O modules provide high-density digital input/output
capabilities in an easy-to-control form. The independent TTL-compatible
inputs and outputs make it well-suited for monitoring and controlling
devices compactly and cost-effectively. Typically, the digital outputs are
used to provide drive for relatively high current devices such as
solenoids, relays and small motors. The digital inputs are used to
monitor devices such as micro-switches. A simplified schematic of a
single digital input and output line is shown below.
A Simple Digital I/O Circuit
The table below lists the available digital I/O modules.
+5V
OPEN COLLECTOR/
CURRENT SINK
(VMOS FET)
DRIVER OUTPUT
INPUT SENSE
REFERENCE
ONE I/O LINE
Model
Number
Module Name
Mainframe
Slots
Required
Descriptions
N2263A 32-Bit Digital I/O
Module
1 The module offers 32-bidirectional I/O lines and
three handshake lines for sensing and control of
external devices up to 42 V, 600 mA. All lines
are TTL-compatible.
44474A 16-Bit Digital I/O
Module
1 The module offers 16-bidirectional I/O lines and
four handshake lines for sensing and control of
external devices up to 30 V, 125 mA. All lines
are TTL-compatible.
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