SIEGER 05701-A-0512 Digital logic module

Block Transfer Backplane Data Transfer The MVI71-103M module is unique in the way that the PLC backplane is utilized for the block transfer interface. Data is paged between the module and the PLC processor across the backplane using BTR and BTW operations. Data is transferred from the module to the processor using the BTR blocks, and data is transferred from the processor to the module using the BTW blocks. The following illustration shows the data transfer method used to move data between the PLC processor, the MVI71-103M module and the serial network.

As shown in the diagram above

 all data transferred between the module and the processor over the backplane is through the BTR and BTW blocks. Ladder logic must be written in the PLC processor to interface the block data with user data files. All data used by the module is stored in its internal database. Data contained in this database is paged through the block transfer interface by coordination of the PLC ladder logic and the MVI71-103M module's program. Up to 64 words of data can be transferred from the module to the processor at one time. Up to 64 words of data can be transferred from the processor to the module. The read and write block identification codes in each data block determine the function to be performed or the content of the data block

These block identification codes

 can be broken down into two groups: Normal data transfer blocks (–1 to 67) and Command control blocks (9901 to 9999). Each of these groups of blocks are discussed in the following topics. Blocks –1 and 0 transfer status data from the module to the processor and they contain no data when transferred from the processor to the module. Blocks 1 to 67 are utilized to transfer data stored or to be stored in the module's database. These data blocks send data from module to the processor (monitored data received from the devices on the serial network) and to send data from the processor to the module (control data to send to the end devices). Block identification codes 9901 to 9999 are used for special control blocks to control the module. Each of these blocks are discussed in the following topics.

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