The terms “cloud” and “cloud computing” have become popular, particularly in discussions about the Internet of Things (IoT). Cloud computing is now being discussed as a technology beneficial for industrial automation.

The origin of the term cloud computing is unclear. In some sense, it is descriptive of something off in the distance over the Internet—but we are not sure where or what is storing information and performing computing. Some claim the term was used in internal documents at Compaq Computer in 1996. Others suggest the term was first commercially used in 2006 when Google and Amazon began using “cloud computing” to describe the new approach to access software, computer power, and files over the Web instead of from local servers or a desktop computer. Whatever the history, cloud computing, or cloud for short, is now a common term. Pictures of local computers networked to the image of a cloud in presentations and literature have become popularized.

The National Institute of Standards and Technology (NIST) defines the term as, “Cloud computing is a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction.” NIST also defines essential characteristics of cloud computing:

On-demand self-service

A user can unilaterally provision computing capabilities, such as server time and network storage, as needed automatically without requiring human interaction with each service provider.

Broad network access

Capabilities are available over the network and accessed through standard mechanisms (i.e., Web services) that promote use by various platforms (e.g., mobile phones, tablets, laptops, and workstations).

Resource pooling

The cloud provider’s computing resources are pooled to serve multiple consumers using a multi-tenant model, with different physical and virtual resources dynamically assigned and reassigned according to user demand. There is a sense of location independence in that the customer generally has no control over or knowledge of the exact location of the provided resources. Examples of resources include storage, processing, memory, and network bandwidth.

Rapid elasticity

Capabilities can be automatically provisioned and scaled to rapidly meet computing and storage needs based on user demand. To the user, the capabilities available often appear to be unlimited and can be appropriated in any quantity at any time.

Measured service

Cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the type of service (e.g., storage, processing, bandwidth, applications, and active user accounts). Resource use can be monitored, controlled, and reported, providing transparency for both the provider and consumer of the utilized service.

Remote computing power and storage

With a fast Internet or intranet connection, cloud computing provides virtually unlimited storage and powerful computing resources without the cost and maintenance of owning powerful computers and vast storage locally. This approach achieves economies of scale with shared resources that deliver powerful computing power and massive storage on demand in secure remote data centers with redundancy and power backup. Companies only pay for what they need without a fixed investment in dedicated hardware or the ongoing cost of software administration, maintenance, and upgrades. In contrast, on-site data centers are capital intensive and have a significant physical footprint, requiring allocations of space, hardware, environmental controls, and support staff. These assets have to be refreshed periodically, resulting in additional capital expenditures.

Another big advantage of cloud computing is it enables mobility, because it is device and location independent. Users can access systems with a Web browser regardless of their location or the device they use (e.g., PC, tablet, smartphone). Google Search is a good example that is a special case of cloud computing financed by advertising. For example, I just searched Google for the term, “cloud computing” on my notebook, and it returned about 136,000,000 results in 320 milliseconds from servers throughout the Internet.

Cloud computing also focuses on maximizing the effectiveness of the shared resources. Cloud resources are typically shared by multiple users and are dynamically reallocated to meet user demand. The advantage is better utilization of cloud computers. For example, a cloud computer facility that serves European users during European business hours may reallocate the same resources to serve North American users during North America’s business hours with a different application. This strength is also a reason cloud computing is not suitable for real-time control applications where availability is essential.

Click here to read the complete article on cloud computing at InTech magazine.

About the Author
Bill Lydon is chief editor of InTech magazine. Lydon has been active in manufacturing automation for more than 25 years. He started his career as a designer of computer-based machine tool controls; in other positions, he applied programmable logic controllers and process control technology. In addition to experience at various large companies, he co-founded and was president of a venture-capital-funded industrial automation software company. Lydon believes the success factors in manufacturing are changing, making it imperative to apply automation as a strategic tool to compete.
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