Rockwell-automation 1769-SM2 Compact I/O DSI/Modbus Communication Modu Manual de usuario descargar pdf (Pagina 191)

Glossary

C CIP (Common Industrial Protocol)

CIP is the transport and application layer protocol used for messaging

over EtherNet/IP, ControlNet, and DeviceNet networks. The protocol is

used for implicit messaging (real time I/O) and explicit messaging

(configuration, data collection, and diagnostics).

Class

A class is defined by the DeviceNet specification as “a set of objects that

all represent the same kind of system component. A class is a

generalization of an object. All objects in a class are identical in form

and behavior, but may contain different attribute values.”

ControlFLASH

An Allen-Bradley software tool that lets users electronically update

firmware on printed circuit boards.

Controller

A controller, also called programmable logic controller, is a solid-state

control system that has a user-programmable memory for storage of

instructions to implement specific functions such as I/O control, logic,

timing, counting, report generation, communication, arithmetic, and data

file manipulation. A controller consists of a central processor, input/

output interface, and memory. See also Scanner.

D DeviceNet Network

An open producer/consumer Controller Area Network (CAN) which

connects devices (for example, controllers, drives, and motor starters).

Both I/O and explicit messages can be transmitted over the network. A

DeviceNet network can support a maximum of 64 devices. Each device

is assigned a unique node address and transmits data on the network at

the same data rate.

A cable is used to connect devices on the network. It contains both the

signal and power wires. Devices can be connected to the network with

drop lines, in a daisy chain connection, or a combination of the two.

General information about DeviceNet and the DeviceNet specification

are maintained by the Open DeviceNet Vendor’s Association (ODVA).

ODVA is online at http://www.odva.org

DSI (Drive Serial Interface)

DSI is based on the Modbus RTU serial communication protocol and is

used by various Allen-Bradley drives, such as PowerFlex 4-Class drives.

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Rockwell-automation 1769-SM2 Compact I/O DSI/Modbus Communication Modu Manual de usuario Pagina 191