ProSoft Technology MVI56-PDPS - Manual (Page 62)

MVI56-PDPS ♦ ControlLogix Platform Reference
Profibus DP Slave Communication Module
Page 62 of 88 ProSoft Technology, Inc.
April 22, 2008
Each image has a defined structure depending on the data content and the
function of the data transfer as defined in the following topics:
5.2.5 Normal Data Transfer
Normal data transfer includes the paging of the user data found in the module's
internal database and the Status Data. These data are transferred through read
(input image) and write (output image) blocks. Refer to Module Configuration
for a description of the data objects used with the blocks. The structure and
function of each block is discussed in the following topics.
Read Block
These blocks of data transfer information from the module to the ControlLogix
processor, and transfer output (control) data sent to the module from the remote
master unit. The structure of the input image used to transfer this data is shown
in the following table:
Word Description Length
0 Write Block ID 1
1 to 122 Read Data 122
123 to 201 Reserved 79
202 Program Scan Counter 1
203 to 206 Block Transfer Status 4
207 to 220 PDPS Status 14
221 to 248 Reserved 28
249 Read Block ID 1
Write Block
These blocks of data transfer information from the ControlLogix processor to the
module and source the input (monitored) data to be used by the remote master.
The structure of the output image used to transfer this data is shown in the
following table:
Word Description Length
0 Write Block ID 1
1 to 122 PROFIBUS input data 122
123 to 200 Reserved 78
201 ti 247 Spare 47
5.2.6 Command Control Blocks
Command control blocks are special blocks used to control the module. The
current version of the software supports the following command control blocks.