ControlNet

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ControlNet is an open industrial network protocol for industrial automation applications, this is also known as a fieldbus. ControlNet was earlier supported by ControlNet International, but in 2008 support and management of ControlNet was transferred to ODVA, which now manages all protocols in the Common Industrial Protocol family.

ControlNet defines a unique physical layer based on RG-6 coaxial cable with BNC connectors. Features which sets ControlNet apart from other fieldbusses includes the built in support for fully redundant cables and the fact that all communication on ControlNet is strictly scheduled and highly deterministic.

The physical layer signaling is based on Manchester code at 5 Mbit/s.

The ControlNet application layer protocol is based on the Common Industrial Protocol (CIP) layer which is also used in DeviceNet and EtherNet/IP.

Controlnet's scheduled message system requires that the media be robustly designed and meticulously maintained. A break in the media invariably causes any running program to stop and often leads to processor faults. The media is checked with a handheld device known as a "Network Checker" in conjunction with a DSO running at 100 MHz or higher. Controlnet was designed after the PLC5 was released, so the PLC5 has some inherent troubles using it. In Rockwell PLC systems the network is configured via RSNetworx For Controlnet. By opening this program the network is scanned and a graphical screen is populated with each node on the network. Each processor has a "scanlist configuration" which shows its connections to remote racks, frequency drives, and any other devices that communicate with it. This program performs for remote racks essentially the same functions as the I/O configuration in the local rack. In the I/O configuration table of Logix, analog cards can be assigned block transfers. In RSNetworx for Controlnet analog cards in remote racks are assigned scheduled messages in blocks of words. Processors communicate with each other via "Produce" and "consume" tags. A processor's produce tag, for instance, may be 50 words starting at N35:900. This block will be broadcast for any other processor to consume. Likewise, the same processor may consume 50 words starting at N32:950 from another processor.

External links

ODVA website

ControlNet International website

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Categories: Serial buses | Network protocols | Automation | Industry | Production and manufacturing | Computer network stubs(and so on)
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