Reference MVI71-DNPSNET
♦
PLC Platform
Distributed Network Protocol Interface Module
ProSoft Technology, Inc.
Page 53 of 100
September 22, 2008
Blocks 1 through 149 transfer data between the module and the processor.
Blocks 1000 to 1148 transfer the initial output databases (binary and analog
output data) from the processor to the module at startup. Blocks 9958 to 9999
are used for command control of the module. Each group of blocks are described
in the following topics.
Normal Data Transfer
Normal data transfer includes the paging of the user data found in the module's
internal databases between the module and the controller. These data are
transferred through read (BTR) and write (BTW) blocks. Refer to the
Module
Configuration
section for a description of the data objects used with the blocks
and the ladder logic required. Each data block transferred between the module
and the processor has a specific block identification code that defines the data
set contained in the block. The following illustration shows the direction of
movement of the DNP data types between the module and the processor:
The structure and function of each block is described in the following topics:
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