MVI56-DH485R
♦
ControlLogix Platform
Reference
DH485 Interface Module for Remote Chassis
User Manual
Page 66 of 97
ProSoft Technology, Inc.
August 27, 2009
The Data table commands require the use of files. These files are emulated in
the module. The user configuration of the module defines how these files are
emulated in the module. Two file mappings are available. The first sets the first
file number and file size for each file. Using this mapping, the files are set as
contiguous files overlaying the database. For example, if the user sets the file
size to 200 and sets the first file number as 7, the files will overlay the database
as shown in the following diagram:
Database
Register
N7:0 ------------>
0
N8:0
------------>
200
N9:0
------------>
400
N10:0
------------>
600
N11:0
------------>
800
N12:0
------------>
1000
N13:0
------------>
1200
N14:0
------------>
1400
N15:0
------------>
1600
N16:0
------------>
1800
N17:0
------------>
2000
N18:0
------------>
2200
N19:0
------------>
2400
N20:0
------------>
2600
N21:0
------------>
2800
N22:0
------------>
3000
N23:0
------------>
3200
N24:0
------------>
3400
N25:0
------------>
3600
N26:0
------------>
3800
In addition to the fixed file emulation, the module also supports user defined
mapping of files. With this mapping, the user defines the database offset, file
number, the starting element number and the length. This data is entered in the
[DH485 Port x Maps] section of the configuration file for each port (x=0 for Port 0
and 1 for Port 1. The following is an example for Port 0:
[DH485R Port 0 Maps]
# DB_Address File_Number Element Length
START
0 10 0 100
100 12 100 100
END
