Mvi56e-mcm database definition – ProSoft Technology MVI56E-MCM/MCMXT User Manual
Page 143

MVI56E-MCM ♦ ControlLogix Platform
Reference
Modbus Communication Module
User Manual
ProSoft Technology, Inc.
Page 143 of 199
June 18, 2014
Note: Terminating resistors are generally not required on the RS-485 network, unless you are
experiencing communication problems that can be attributed to signal echoes or reflections. In
these cases, installing a 120-ohm terminating resistor between pins 1 and 8 on the module
connector end of the RS-485 line may improve communication quality.
RS-485 and RS-422 Tip
If communication in the RS-422 or RS-485 mode does not work at first, despite
all attempts, try switching termination polarities. Some manufacturers interpret +
and -, or A and B, polarities differently.
6.3.7 DB9 to RJ45 Adaptor (Cable 14)
6.4
MVI56E-MCM Database Definition
This section contains a listing of the internal database of the MVI56E-MCM
module. This information can be used to interface other devices to the data
contained in the module.
Register Range
Modbus Low
Modbus High
Content
Size
0 to 5999
40001
50000
User Data
10000
10000 to 10009
50001
50010
Backplane Configuration
10
10010 to 10039
50011
50040
Port 1 Setup
30
10040 to 10069
50041
50070
Port 2 Setup
30
10070 to 12669
50071
52670
Port 1 Commands
2600
12670 to 15269
52671
55270
Port 2 Commands
2600
15270 to 15359
55271
55350
Misc. Status Data
80