
Reference MVI56E-SIE ♦ ControlLogix Platform
User Manual Client Communication Module
Page 138 of 168 ProSoft Technology, Inc.
September 6, 2012
These block identification codes can be broken down into two groups:
Normal data transfer blocks
Read and Write blocks (-1 to 25)
Special function blocks
Initialize Output Data blocks (1000 to 1024)
Client Status blocks (3000 to 3029)
Command Control blocks (5001 to 5016)
Module IP Address blocks (9990 and 9991)
Warm-boot and Cold-boot blocks (9998 and 9999)
5.2.1 Normal Data Transfer Blocks
Normal data transfer includes the paging of user data from the module’s internal
database (registers 0 to 4999), as well as paging of status data. These data are
transferred through read (input image) and write (output image) blocks.
The following topics describe the function and structure of each block.
Read Block
These blocks of data transfer information from the module to the ControlLogix
processor.
The following table describes the structure of the input image.
Read Block from Module to Processor
Command bit data for Clients
The Read Block ID is an index value used to determine where the 200 words of
data from module memory will be placed in the ReadData[x] controller tag array
of the ControlLogix processor. Each transfer can move up to 200 words (block
offsets 2 to 201) of data. In addition to moving user data, the block also contains
status data for the module. The Write Block ID associated with the block requests
data from the ControlLogix processor.
During normal program operation, the module sequentially sends read blocks
and requests write blocks.
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