Prosoft-technology MVI56E-MCMR Manual de usuario descargar pdf (Pagina 144)

Reference MVI56E-MCMR ♦ ControlLogix Platform

User Manual Modbus Communication Module with Reduced Data Block

Page 144 of 225 ProSoft Technology, Inc.

May 13, 2014

6.1 About the Modbus Protocol

Modbus is a widely-used protocol originally developed by Modicon in 1978. Since

that time, the protocol has been adopted as a standard throughout the

automation industry.

The original Modbus specification uses a serial connection to communicate

commands and data between Master and Slave devices on a network. Later

enhancements to the protocol allow communication over other types of networks.

Modbus is a Master/Slave protocol. The Master establishes a connection to the

remote Slave. When the connection is established, the Master sends the Modbus

commands to the Slave. The MVI56E-MCMR module can work as a Master and

as a Slave.

The MVI56E-MCMR module also works as an input/output module between itself

and the Rockwell Automation backplane and processor. The module uses an

internal database to pass data and commands between the processor and

Master and Slave devices on Modbus networks.

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Prosoft-technology MVI56E-MCMR Manual de usuario Pagina 144