Wednesday, April 11, 2012

Communication Module of Modbus RTU/ASCII Master/Slave





The MVI46 Communication Module of Modbus Master/Slave enables SLC processors of Rockwell Automation to interface simply with other compatible devices of Modbus protocol.

Compatible devices comprise not only Modicon PLCs but also a broad variety of end devices. The module operates as a module of input/output between the network of Modbus and the backplane of Rockwell Automation.

Advantages and Features
The Communications module of inRAx Modbus Master/Slave is planned to let SLC processors to interface simply with Modbus protocol-compatible hosts and devices.

The module of MVI46-MCM works as a module of input/output between the network of Modbus and the backplane of Rockwell Automation. The data transmit from the processor of SLC is asynchronous from the accomplishments on the network of Modbus. A register space of 5000-word in the module replaces data between the network of Modbus and the processor.

A lot of host SCADA packages support the protocol of Modbus, while devices generally supporting the protocol comprise some PLCs.

General Specifications
• 1746 backplane compatible - Single Slot (Local or expanded I/O rack only).
• The module is accepted as a module of Input/Output and has admission to processor memory for transfer data between module and processor using files of M0/M1.
• Ladder Logic is utilized for data transfer between processor and module
• Data configuration acquired throughout user-defined ladder. File of sample ladder included

Applications
Applications with the Communication Module of Modbus can be found in numerous industrial sectors as following:
• Data concentrator of foreign device
• Platforms of pipelines and offshore
• Processing of Food
• Pulp and paper
• Mining
• Communications of SCADA

Specifications of Slave
The module of MVI46-MCM recognizes code commands of Modbus function from an attached master unit of Modbus. A port organized as a slave of Modbus allows a remote master to interrelate with all data enclosed in the module. This data can be developed from other slave devices of Modbus on the network, throughout a port of master, or from the processor of SLC.

Specifications of Master
A port organized as a virtual master device of Modbus on the module of MVI46-MCM actively issues commands of Modbus to other nodes on the network of Modbus. One hundred commands are supported on every port. In addition, the ports of master have an optimized polling typical that polls slaves with less often communication problems. The processor of SLC can be planned to control the motion on the port by dynamically choosing commands from the list of command to perform directly from the ladder logic.


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