MVI56-BDW
♦
ControlLogix Platform
Reference
BARDAC Drive Web Interface
Page 60 of 82
ProSoft Technology, Inc.
September 4, 2008
Block Range
Descriptions
-1
Null block
0
Null block
1 to 25
Read or write data
1000 to 1024
Output Initialization Blocks
2000
Event Command Block
5001 to 5006
Command Control
9998
Warm-boot control block
9999
Cold-boot control block
These block identification codes can be broken down into a few groups: Normal
data transfer blocks (-1 to 25), Initialization blocks (1000 to 1024) and Command
control blocks (2000, 5000 to 5006, 9998 and 9999).
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. Refer to
the
Module Set Up
section 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 below:
Read Block
These blocks of data transfer information from the module to the ControlLogix
processor. The structure of the input image used to transfer this data is shown
below:
Offset Description
Length
0
Reserved
1
1
Write Block ID
1
2 to 201
Read Data
200
202
Program Scan Counter
1
203 to 208
Block Transfer Status
6
209 to 218
Bardac DW Client 0 Status
10
219 to 228
Bardac DW Client 1 Status
10
229 to 238
Bardac DW Client 2 Status
10
239 to 248
Bardac DW Client 3 Status
10
249
Read Block ID
1
The Read Block ID is an index value used to determine the location of where the
data will be placed in the ControlLogix processor controller tag array of module
read data. 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.
