ProSoft Technology MVI69-EGD - Manual (Page 81)

Reference MVI69-EGD ♦ CompactLogix or MicroLogix Platform
GE Ethernet Global Data Communication Module
ProSoft Technology, Inc. Page 81 of 96
November 3, 2008
Each image has a defined structure depending on the data content and the
function of the data transfer.
5.2.6 Normal Data Transfer
Normal data transfer includes the paging of the user data found in the module's
internal database in registers 0 to 3999 and the status data. These data are
transferred through read (input image) and write (output image) blocks. Refer to
the Module Configuration and Ladder Logic sections for a description of the
data objects used with the blocks and the ladder logic required. The structure
and function of each block is discussed in the following topics.
Normal Input Data Block
These blocks of data transfer information from the module to the CompactLogix
or MicroLogix 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.
Words Description
0 Block read ID
1 Block write ID requested
2 to n Input data (60, 120 or 240 words)
where n = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the
configuration file).
Normal Input Empty Data Block
Words Description
0 Block read ID (0 or -1)
1 Block write ID requested
2 Program scan counter
3 Block write counter
4 Block read counter
5 Block parse counter
6 Block error counter
7 SNTP valid time
8 SNTP request count
9 SNTP response count
10 SNTP computation count
11 SNTP set count
12 SNTP timeout error count
13 SNTP seconds (LSW)
14 SNTP seconds (MSW)
15 SNTP microseconds (LSW)
16 SNTP microseconds (MSW)
17 to n Reserved
where n = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the
configuration file).