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7. D IGITAL I/O C ARDS
Chapter 7 describes the features of the Digital I/O Card, one of
the I/O cards designed for the Smart Star embedded control sys-
tem.The Smart Star is a modular and expandable embedded con-
trol system whose configuration of I/O, A/D Converter, D/A
Converter, and Relay Cards can be tailored to a large variety of
demanding real-time control and data acquisition applications.
The typical Smart Star system consists of a rugged backplane with a power supply, a CPU
card, and one or more I/O cards. The CPU Card plugs into a designated slot on the back-
plane chassis, which has seven additional slots available for I/O cards to be used in any
combination. A high-performance Rabbit 2000 microprocessor on the CPU Card provides
fast data processing.
7.1 Features
The SR9200 Digital I/O Cards offer protected digital inputs and high-current driver out-
puts in three banks, each containing 8 I/O points. One bank’s configuration is fixed as pro-
tected digital inputs, one bank’s configuration is fixed as high-current driver outputs, and
one bank may be configured either as protected digital inputs or as high-current driver out-
puts, depending on the model of Digital I/O Card selected. The high-current driver outputs
are either all sinking or all sourcing, depending on the model of Digital I/O Card selected.
Table 8 lists the Digital I/O Cards that are available for the Smart Star control system.
Table 8. Smart Star Digital I/O Cards
I/O Card
Digital I/O
Model
SR9200
SR9210
SR9220
Features
16 digital inputs, 8 digital sinking outputs
8 digital inputs, 16 digital sinking outputs
8 digital inputs, 8 digital sinking outputs
User ’s Manual
SR9205
SR9215
SR9225
16 digital inputs, 8 digital sourcing outputs
8 digital inputs, 16 digital sourcing outputs
8 digital inputs, 8 digital sourcing outputs
71
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