ProSoft Technology MVI56-DFCM - Manual (Page 74)

Reference MVI56-DFCM ♦ ControlLogix Platform
User Manual DF1 Half/Full Duplex Master/Slave Serial Communication Module
Page 74 of 106 ProSoft Technology, Inc.
September 24, 2014
All data transferred between the module and the processor over the backplane is
through the input and output images. Ladder logic must be written in the
ControlLogix processor to interface the input and output image data with data
defined in the Controller Tags. All data used by the module is stored in its internal
database. The following illustration shows the layout of the database:
Module’s Internal Database Structure
5000 registers for user data 0
Register Data
4999
3400 words of configuration and
status data 5000
Status and Config
8399
Data contained in this database is paged through the input and output images by
coordination of the ControlLogix ladder logic and the MVI56-DFCM module's
program. Up to 248 words of data can be transferred from the module to the
processor at a time. Up to 247 words of data can be transferred from the
processor to the module. The read and write block identification codes in each
data block determine the function to be performed or the content of the data
block. The block identification codes used by the module are listed below:
Block Range Descriptions
-9000 Configuration data (sent from module)
-7100 Port 2 Override File Maps (sent from module)
-7000 Port 1 Override File Maps (sent from module)
-6100 to -6104 Port 2 commands (sent from module)
-6000 to -6004 Port 1 commands (sent from module)
-1 Null block
0 Null block
1 to 999 Read or write data
1000 Event Port 1
2000 Event Port 2
3000 to 3001 Port 1 slave polling control
3002 to 3003 Port 1 slave status
3100 to 3101 Port 2 slave polling control
3102 to 3103 Port 2 slave status
5000 to 5006 Port 1 command control
5100 to 5106 Port 2 command control
6000 to 6004 Port 1 commands (sent to module)