1C31147G01 Digital output module

The MVI69-MCM module communicates directly over the CompactLogix or MicroLogix backplane. Data is paged between the module and the CompactLogix or MicroLogix processor across the backplane using the module's input and output images. The update frequency of the images is determined by the scheduled scan rate defined by the user for the module and the communication load on the module. Typical updates are in the range of 2 to 10 milliseconds. The data is paged between the processor and the module using input and output image blocks. You can configure the size of the blocks using the Block Transfer Size parameter in the configuration file. You can configure blocks of 60, 120, or 240 words of data depending on the number of words allowed for your own application.

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 MVI69-MCM module can work as a Master and as a Slave.

Module Power Up 

On power up the module begins performing the following logical functions: 1 Initialize hardware components o Initialize CompactLogix or MicroLogix backplane driver o Test and Clear all RAM o Initialize the serial communication ports 2 Module configuration 3 Initialize Module Register space 4 Enable Slave Driver on selected ports 5 Enable Master Driver on selected ports After this initialization procedure is complete, the module will begin communicating with other nodes on the network, depending on the configuration

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