What is ControlNet?

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Need a solution to talk on your industrial network? Let’s look at ControlNet.

ControlNet is an open industrial network protocol and is managed by formerly “Open DeviceNet Vendors Association” or ODVA.

ControlNet is based on a token-passing bus control network and we will talk more about how this part works as we move along.

ControlNet utilizes the Common Industrial Protocol (CIP) for the upper layers of the Open Systems Interconnection (OSI) model that has seven layers:
physical, data link, network, transport, session, presentation, and application.

The designers of ControlNet adapted the CIP layers of transport, network, data link and physical to fit the needs of the ControlNet network.

ControlNet was designed to provide reliable, high-speed control and I/O data transfer by using programming that sets the logic to specific timing over the network.

It also provides for critical messaging that does not rely on timing to be executed without interfering with the transport of control and I/O data.

The types of devices that the ControlNet network talks to are Programmable Logic Controllers, I/O chassis, HMIs, personal computers, drives, and robots.

It is typically used for redundant applications and/or applications that work best with scheduled communications.

ControlNet has a data transfer rate of 5 Mbps and is in the mid-range of the three popular networks with EtherNet/IP ranging from 10 Mbps to 1 Gbps and DeviceNet ranging from 125 to 500 Kbps.

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