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
M
ODBUS
P
ORT X
C
OMMANDS
section. The location
of these error codes are determined by the parameter
M
ODBUS
P
ORT X
C
OMMAND
E
RROR
P
OINTER
.
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.R
EAD
D
ATA
array.
Once again, the configuration in the
B
ACKPLANE
C
ONFIGURATION
section for
R
EAD
R
EGISTER
S
TART
and
R
EAD
R
EGISTER
C
OUNT
determine which of the 5000
registers will be presented to the ControlLogix processor and placed in the tag
MCMR.DATA.R
EAD
D
ATA
array.
Based on the sample configuration values for
R
EAD
R
EGISTER
S
TART
and
R
EAD
R
EGISTER
C
OUNT
,
this will be addresses 1000 to 1599 of the module memory.
The following illustration shows the sample configuration values.
