Comunicaciones en DeviceNet
DeviceNet Network Overview
The DeviceNet™ network is a flexible and open, low-cost option you can use to connect industrial devices to a network and to eliminate costly and time-consuming hardwiring. Direct connectivity improves communication and provides device-level diagnostics not available or easily accessible through hardwired I/O interfaces.
DeviceNet is an open standard, it saves you time and money at start-up—a key advantage for OEMs. Because it uses a trunk line/drop line topology, a single DeviceNet cable provides power and communication signal to all devices on the network. This significantly reduces the amount of wiring required and greatly simplifies installation. Adding and removing devices from the network is a simple process—a key advantage for end-users. You do not need to add or remove any wires. Simply connect or disconnect the device to or from the trunk line and configure the scan list. It really is that easy.
And there is no need to plan ahead for future expansion by laying extra cable or buying additional cabinet space. With DeviceNet, you can expand if and only when you want to.
Benefits
Interchangeability. Simple devices (e.g., push buttons, motor starters, photo cells, limit switches, etc.) from multiple vendors that comply with DeviceNet network and device profile standards are interchangeable, giving users flexibility and choices.
One common network. An open device network standard provides common end-user solutions, reducing the need for vendors to support a variety of the device networks on the market.
Reduce downtime. Diagnostics provide predictive failure warnings and troubleshooting.
Reduction in plant wiring (eliminates hardwiring of I/O).
Lower installation, start-up, and maintenance times. Superior device-level diagnostics.
Ability to bridge to higher level networks.
Device Plug and Play capabilities—add or remove nodes on the fly.
Monitor your systems remotely; program and configure during run-time.
Product Design
The DeviceNet network provides more than just a protocol specification. It provides interoperability through standardized:
Open- and sealed-type device connectors.
Diagnostic indicators (LEDs).
Device profiles.
In addition to reading the state of on/off sensors and operating motor starters, the DeviceNet network can report temperatures and the load current in the motor starter, change the deceleration rate of drives, adjust the sensitivity of sensors, and more. Devices also may be removed and replaced without shutting down other devices and without programming tools, which helps lower maintenance costs.
Networked device installation is more cost-effective than traditional I/O wiring in many applications, particularly when devices are spread over several hundred feet.
Communication
The DeviceNet network is based on proven, well-known CAN technology, which helps to ensure both end user and industry-wide understanding and acceptance.
An open device network standard helps to improve overall productivity by giving end users more choices and encouraging device innovations that can improve accuracy, provide diagnostics, and increase the amount of process data.
Messages from a node on either a ControlNet link or an Ethernet link can be routed through the ControlLogix to a node on a DeviceNet link.
Typical Applications
The DeviceNet network is ideal for applications requiring:
Wire reduction.
Quick installations and start-ups.
Flexibility to add or move devices and cable segments.
Fast response time.
Diagnostics from devices for critical uptime requirement.
Device configuration.
DeviceNet Typical Configuration
