Specifications

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Programmable logic controllers (PLCs)
Overview
modules; the exact content of each
of these modules will likely be as
diverse as are the applications. Many
modules have multiple functions that
can interface with multiple sensor
interfaces. Yet other modules or
expansion modules are often
dedicated to a specific application
such as a resistance temperature
detector (RTD), sensor, or thermo-
couple sensor. In general, all modules
have the same core functions: analog
input, analog output, distributed
control (e.g., a fieldbus), interface,
digital input and outputs (I/Os), CPU,
and power. We will examine each of
these core functions in turn, and
leave sensors and sensor interfaces
for a separate section.
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