Configuration as a Modbus Master MVI56-MCM ♦ ControlLogix Platform
Modbus Communication Module
ProSoft Technology, Inc. Page 27 of 159
July 24, 2008
The following is the sample configuration layout of the tags and addressing.
The MVI56-MCM sample program is configured for 600 registers of ReadData
and 600 registers of WriteData. In most applications, this is plenty of data tags for
an application, but in some cases you may require more user data. To increase
the array size for your application, follow the steps described below.
Because the module pages data in blocks of 200 registers at a time, you will
want to keep this as a number divisible by 200.
Note: Changing the array size may zero out all tags in the MCM tag location, usually at Step 3 of
this procedure. Make sure you have saved any configuration you have already done so you can
reference this later in case the data values in the MCM array are reset to 0.
For example, if your application will require 1000 words of read data, instead of
the default 600 words, follow the steps below to make this change.
1 Click on MCMDATA from the User-Defined data type in the Controller
Organization List.
2 Change ReadData array from INT[600] to INT[1000] as shown.
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