Device Net

DeviceNet is an open network designed to replace large, complex wiring schemes with a simple trunk and branch structure, while also providing a high-level of diagnostics to each device on the network. DeviceNet's open network architecture allows products from different vendors to communicate and work together. Open Architecture means users can easily add incremental devices to an existing or planned installation. DeviceNet is able to work with either a Programmable Logic Controller (PLC) or an industrial Personal Computer (iPC) as the controller.

Welcome to Module 26, which is about DeviceNet, a communication protocol that allows individual devices (Starters, Photoelectric Sensors, scanners, etc.) to communicate with the network controller. DeviceNet users may choose either an Industrial Personal Computer (iPC) or a Programmable Logic Controller (PLC) as their controller. DeviceNet allows its users to replace large amounts of wiring with a single cable. It also introduces small chips onto each device to enable communication and allow the devices to gather diagnostic information.

Like the other modules in this series, this one presents small, manageable sections of new material followed by a series of questions about that material. Study the material carefully, then answer the questions without referring back to what you've just read. You are the best judge of how well you grasp the material. Review material as often as you think necessary. The most important thing is establishing a solid foundation to build on as you move from topic to topic and module to module.

Figure 1. A DeviceNet Network

Device Net advantages

• Reduced set-up and installation times because of a simplified multi-drop wiring scheme and the elimination of point-to-point wiring. DeviceNet can also reduce potential wiring errors and the time it takes to fix them. This may decrease wiring costs by a factor of three or four.
• Significantly lower on-going maintenance costs. Smart devices can detect a problem before it causes serious damage, loss of product, or downtime.
• Reduced downtime due to diagnostics down to the node level.
• Downsized engineering departments view smart I/O as a time-saver. For example, instruments have database ability, can be calibrated in the field, and can perform remote diagnostics.
• Plug and play capability, as well as improved troubleshooting and diagnostics, reduces downtime.
• DeviceNet will help plants comply with quality, ISO 9000 regulatory and safety standards.
• Ability to easily add incremental devices to an existing or planned installation.
• Increased intelligence in the nodes, distributed logic, will eliminate the need for separate controllers for many applications.

Here are a few other common DeviceNet applications:

• Material Handling-Conveyor belts and storage systems can eliminate long runs of hard-wired control; plus, the installation time is greatly reduced.
• Packaging-Again, significantly reduced installation time lowers start-up costs for new systems. Packaging is an industry with a lot of maintenance and downtime. The diagnostics inherent in intelligent control keep that to a minimum.
• Food and beverage-Filling, bottling, baking, and canning machines can be tied into a monitoring program for greater efficiency and safety.
• Machine tools-Metal cutting, forming, and drilling operations cannot only save wiring and startup costs, but with online adjustments of device parameters, reconfiguring for new jobs is a snap.

D50 PLC

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With the D50 I/O is expandable from 14 to 56 points simply by adding as many as three digital expander units to the D50 programable controller up to two analoge I/O expanders may be added to complete the system .