MVI56E-MCM ♦ ControlLogix Platform Reference
Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 193 of 209
Selecting the Slot Number for the Module
The sample application is for a module installed in Slot 1 in a ControlLogix rack.
The ladder logic uses the slot number to identify the module. If you are installing
the module in a different slot, you must update the ladder logic so that program
tags and variables are correct, and do not conflict with other modules in the rack.
To change the slot number
1 In the CONTROLLER ORGANIZATION list, select the module [1] 1756-MODULE
MVI56, and then click the right mouse button to open a shortcut menu.
2 On the shortcut menu, choose PROPERTIES. This action opens the MODULE
PROPERTIES dialog box.
3 In the SLOT field, use the up and down arrows on the right side of the field to
select the slot number where the module will reside in the rack, and then click
OK.
RSLogix will automatically apply the slot number change to all tags, variables
and ladder logic rungs that use the MVI56E-MCM slot number for computation.
Adjust the Input and Output Array Sizes
Note: The following steps are only required if you are using the sample ladder logic (RSLogix
version 15 or older) rather than the Add-On Instruction (RSLogix version 16 or newer).
1 Click ReadData to open ladder file and go to rung #2 of this file.
2 Change the High Limit on the LIM statement to allow for 5 blocks of data, as
shown in the following illustration.
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