Reliance Electric S-D4006-D module

Normal data transfer includes the transferring of data received by or to be transmitted to the master drivers and the status data. These data are transferred through read and write blocks when the block transfer interface is used. This data is automatically placed in the user data files when the side-connect interface is used. The following topics discuss the structure and function of each block.The Block Identification Code (word 0) is used to signal to the PLC processor that a new block is ready for processing and informs the processor of the contents of the block. If the value of the code is set to 1, the block contains the first 60 words of data contained in the database of the module.

If the block identification code in word zero is -1 or 0

the block contains the module's status data and should be copied to the status user data file in the PLC. This information can be used to determine the "health" and activity of the module. Refer to the Reference chapter for a detailed listing of the area and its contents. The block also contains the block identification code the module expects to receive from the processor (word 1 in the block). Under normal data transfer conditions, the ladder logic should use the code to build the appropriate block for the module in the output image. Write Block These blocks of data transfer information from the PLC processor to the module. The structure of the block used to transfer this data is shown in the following table.

The Block Identification code defines

 the content of the data contained in the block. If the code is set to -1 or 0, the data area contains no valid data. If the word contains a value from 1 to 67, the data contained in the block should be placed in the appropriate position of the module's database. Under normal conditions, the value used for the write block identification code should be that received in the read block from the module. Command Control Blocks Block identification codes greater than 9900 are utilized to perform special functions in the module. When the side-connect interface is utilized, the file number selected for the configuration/status file is used for this feature. The data blocks shown below are placed in this file starting at word 50. Each control block recognized and used by the module is defined in the following topics.

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