MVI56-MCM ♦ ControlLogix Platform Configuration as a Modbus Master
Modbus Communication Module
Page 28 of 159 ProSoft Technology, Inc.
July 24, 2008
3 Click on the Apply button located at bottom of window.
Note: You may get a message telling you that data values have been reset, make sure that you
have saved a backup copy of your program if you have parameters configured.
4 Next, click Controller Tags. This action opens the MVI56MCM window.
Verify that the Monitor Tags tab is selected (see Monitor/Edit tags on bottom
of window).
Note: Be aware that the window parameters can be changed by clicking between Monitor and Edit
tags. You can use the scroll bar to view parameter columns for each tag too.
5 Click on [+] to open the MCM.CONFIG.ModDef section and change the
ReadRegCnt parameter from the default 600 to 1000 for your application.
6 Click ReadData to open ladder file and go to rung #2 of this file.
7 Change the High Limit on the LIM statement to allow for 5 blocks of data.
(1000 registers / 200 registers per block = 5 blocks of data)
This step is shown below.
8 Verify the change to this rung. Toggle the
object within RSLogix 5000.
9 Save and download ladder to the processor.
10 When Online with the ControlLogix processor, toggle the
MCM.CONTROL.WarmBoot bit to download the change made in Step 5 to
the processor.
Note: Any changes made to the MCM.CONFIG array must be downloaded to the MVI56MCM
module. The use of the MCM.CONTROL.WarmBoot or MCM.CONTROL.ColdBoot bit will force the
MVI56MCM module to re- read the configuration from the ControlLogix processor.
This holds true for changes made to the WriteData array.
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