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 Client and server devices on a network. Later enhancements to the protocol allow communication over Ethernet networks using TCP/IP as a "wrapper" for the MODBUS protocol. This protocol is known as MODBUS TCP/IP.

MODBUS TCP/IP is a Client/server protocol. The Client establishes a connection to the remote server. When the connection is established, the Client sends the MODBUS TCP/IP commands to the server. The MVI56E-MNETC module works both as a Client and as a server.

Aside from the benefits of Ethernet versus serial communications (including performance, distance, and flexibility) for industrial networks, the MODBUS TCP/IP protocol allows for remote administration and control of devices over a TCP/IP network. The efficiency, scalability, and low cost of a MODBUS TCP/IP network make this an ideal solution for industrial applications.

The MVI56E-MNETC module acts as an input/output module between devices on a MODBUS TCP/IP network and the Rockwell Automation backplane. The module uses an internal database to pass data and commands between the processor and the Client and server devices on the MODBUS TCP/IP network.  

Align the module using the upper and lower tongue-and-groove slots with the adjacent module and slide forward in the direction of the arrow. 

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