In general, modules are classified as analog, digital, communication, controller, and specialty. They differ by the number of channels, the ranges of input and output they are capable of handling, and by the special features that are optionally available. In this section, we will explore the base module types and explain the possible feature sets.
In the following sections, we will enumerate some of the most common module types in the ControlLogix and CompactLogix families of controllers. We will cover the basic categories of modules that are available for Rockwell controllers, which include analog modules, digital modules, communication modules, CPU modules, and motion control modules.
Analog modules
Analog modules process the input and output of signals that vary by current and voltage and translate to real-world values, such as pressure, temperature, and flow. Analog modules vary by the number of channels (4 to 16), the...
