ProSoft Technology MVI56E-MNETR - Manual (Page 106)

MVI56E-MNETR ♦ ControlLogix Platform Reference
Modbus TCP/IP Interface Module with Reduced Data Block User Manual
Page 106 of 153
ProSoft Technology, Inc.
August 31, 2009
Normal Data Transfer
Normal data transfer includes the paging of the user data found in the module’s
internal database in registers 0 to 4999 and the 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.
Status Read Data Block
This block is automatically copied from the module and contains status
information about the module.
Offset Description Length
0 Write Block ID 1
1 Program Scan Counter 1
2 to 7 Block Transfer Status 6
8 to 9 Reserved Server Status 2
10 to 11 MNET Server Status 2
12 to 13 MBAP Server Status 2
14 to 23 MNET Client Status 10
24 to 40 Reserved 17
41 Read Block ID (-1 or 0) 1
MVI56E-MNETR Client Status
Offset Client Status
3 Total number of command list requests
4 Total number of command list responses
5 Total number of command list errors
6 Total number of requests of slave
7 Total number of responses
8 Total number of errors sent
9 Total number of errors received
10 Total number of Configuration Errors
11 Total number of Current Errors
12 Last Error
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.
Offset Description Length
0 Write Block ID 1
1 to 40 Read Data 40
41 Read Block ID 1