ProSoft Technology MVI69-EGD - Manual (Page 82)

MVI69-EGD ♦ CompactLogix or MicroLogix Platform Reference
GE Ethernet Global Data Communication Module
Page 82 of 96 ProSoft Technology, Inc.
November 3, 2008
Normal Output Data Block
These blocks of data transfer information from the CompactLogix or MicroLogix
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.
Words Description
0 Block write ID
1 to n Output data (60, 120 or 240 words)
where n = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the
configuration file).
The Write Block ID is an index value used to determine the location in the
module's database where the data will be placed. Each transfer can move up to
200 words (block offsets 1 to 200) of data.
5.2.7 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.
Code Description
-1 or 0 Empty data blocks
1 to 20 Data read or write blocks
2000 C/P status data
9250 General status data
9998 Warm boot module (same effect as 9999)
9999 Cold boot module
Block 2000 Request
Words Description
0 2000 Command Block ID
1 Number of C/P messages (1 to 4)
2 First C/P index (0 to 99)
3 to n Reserved
where n = 60, 120, or 240 depending on the Block Transfer Size parameter (refer to the
configuration file).
Block 2000 Response
Words Description
0 2000 Command Block ID
1 Block write ID requested
2 Number of C/P messages (0 to 4) Will be set to 0 if error in request.
3 First C/P index (0 to 99)
4 to 17 C/P Status Data
18 to 31 C/P Status Data
32 to 45 C/P Status Data