Diagnostics and Troubleshooting MVI56E-MCM ♦ ControlLogix Platform
User Manual Modbus Communication Module
Page 116 of 209 ProSoft Technology, Inc.
5.8 Reading Status Data from the Module
The MVI56E-MCM module returns a 33-word Status Data block that can be used
to determine the module’s operating status. This data is located in the module’s
database at registers 15270 to 15302 and at the location specified in the
configuration. This data is transferred to the ControlLogix processor continuously
with each read block. For a complete listing of the status data object, refer to
MVI56E-MCM Status Data Definition (page 160).
5.8.1 Viewing the Error Status Table
Command execution status and error codes for each individual command are
stored in a Master Command Status/Error List, held in the module’s internal
memory. There are several ways to view this data.
View Command Status, Slave Status and Port Status in the Monitoring
Modbus Port Information (page 111).
Configure the Command Error Pointer parameter (<CmdErrPtr>) to copy the
status/error values into the User Database area of module memory.
Copy this table to a section of the ReadData area, where you can view it in
the <READDATAARRAY> tag array in the ControlLogix controller tag database.
You can use these values for communications status monitoring and
alarming.
o <CMDERRPTR> = "MCM.CONFIG.PORTX.CMDERRPTR"
o <READDATAARRAY> = "MCM.DATA.READDATA[X]"
These variables would hold the literal tag names in the sample program or
Add-On Instruction. Use these variables to accommodate future ladder or tag
changes while maintaining backward compatibility.
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