1C31197G05 Digital input module

The Master driver obtains configuration data from the user defined .CFG file that is stored locally on the MVI69-MCM module itself. The configuration data obtained includes port configuration and the Master Command List. Special Ccommands can be issued directly from the CompactLogix or MicroLogix processor (using Event Commands and Command Control). These configuration and command values are used by the Master driver to determine the types and order of commands to send to slaves on the network.After configuration, the Master driver begins transmitting read and/or write commands to slave nodes on the network. If writing data to slave, the data for the write command is obtained from the module’s internal database to build the command.

Once the specified slave

 has successfully processed the command, it will return a response message to the Master driver for processing.Data received from a slave in response to a read command is passed to the module’s and stored in its internal database.Status is returned to the CompactLogix or MicroLogix processor for each command in the Master Command List.Important: You must take care when constructing each command in the list to ensure predictable operation of the module. If two commands write to the same internal database address of the module, the results will be invalid. All commands containing invalid data are ignored by the module.

Master Command List

 In order to function in the Master Mode, you must define the module’s Master Command List. This list contains up to 100 individual entries, with each entry containing the information required to construct a valid command. A valid command includes the following items:
Command enable mode: (0) disabled, (1) continuous or (2) conditional
Slave Node Address
Command Type: Read or Write up to 125 words (16000 bits) per command
Database Source and Destination Register Address: The addresses where data will be written or read.
Count: The number of words to be transferred - 1 to 125 on FC 3, 4, or 16. Select the number of bits on FC 1, 2, 15.

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