Verify Communication MVI56E-MCMR ♦ ControlLogix Platform
User Manual Modbus Communication Module with Reduced Data Block
Page 108 of 223 ProSoft Technology, Inc.
3.1.2 Command Error Codes
The MVI56E-MCMR module will return an individual error code for every
command configured within the MODBUS PORT X COMMANDS section. The location
of these error codes are determined by the parameter MODBUS PORT X COMMAND
ERROR POINTER. This parameter determines where in the module's 5000-register
database the error codes for each command will be placed. The number of error
codes returned into the database is determined by the number of commands
configured in the Modbus Port x Commands section of the configuration. For 10
commands, 10 registers will be used; for 100 commands, 100 registers will be
used.
To be useful in the application, these error codes must be placed within the
MCMR.DATA.READDATA array.
Once again, the configuration in the BACKPLANE CONFIGURATION section for
READ REGISTER START and READ REGISTER COUNT determine which of the 5000
registers will be presented to the ControlLogix processor and placed in the tag
MCMR.DATA.READDATA array.
Based on the sample configuration values for READ REGISTER START and READ
REGISTER COUNT, this will be addresses 1000 to 1599 of the module memory.
The following illustration shows the sample configuration values.
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