If you're familiar with industrial automation, you may have heard of PLCs. So, what are PLCs and why are they so important in the world of automation?

PLC stands for Programmable Logic Controller. They are industrial computers used to control different electro-mechanical processes for use in manufacturing, plants, or other automation environments.

PLCs vary in size and form factors. Some are small enough to fit in your pocket while others are large enough to require their own heavy-duty racks to mount. Some PLC’s can be customized with back planes and functional modules to fit different types of industrial applications.

A PLC’s functions are divided into three main categories: inputs, outputs and the CPU. PLCs capture data from the plant floor by monitoring inputs that machines and devices are connected to. The input data is then processed by the CPU, which applies logic to the data, based on the input state. The CPU then executes the user-created program logic and outputs data or commands to the machines and devices it is connected to.

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The MVI56 Modbus Master/Slave Communication Module allows Automation® ControlLogix® processors to interface easily with other Modbus protocol compatible devices. The module acts as an Options module between the Modbus network and the ControlLogix backplane.

Compatible devices include not only Modicon® PLCs (almost all support the Modbus protocol) but also a wide range of process and control devices from a variety of manufacturers. Many SCADA packages also support the Modbus protocol.