MVI56-MCM ♦ ControlLogix Platform Verify Communications
Modbus Communication Module
Page 62 of 159 ProSoft Technology, Inc.
July 24, 2008
Offset Content Description
218
Port 2 Command List
Requests
This field contains the number of requests made from this
port to slave devices on the network.
219
Port 2 Command List
Response
This field contains the number of slave response messages
received on the port.
220
Port 2 Command List
Errors
This field contains the number of command errors processed
on the port. These errors could be due to a bad response or
command.
221 Port 2 Requests
This field contains the total number of messages sent out the
port.
222 Port 2 Responses
This field contains the total number of messages received on
the port.
223 Port 2 Errors Sent
This field contains the total number of message errors sent
out the port.
224
Port 2 Errors
Received
This field contains the total number of message errors
received on the port.
225 Read Block Count
This field contains the total number of read blocks
transferred from the module to the processor.
226 Write Block Count
This field contains the total number of write blocks
transferred from the module to the processor.
227 Parse Block Count
This field contains the total number of blocks successfully
parsed that were received from the processor.
228
Command Event
Block Count
This field contains the total number of command event
blocks received from the processor.
229
Command Block
Count
This field contains the total number of command blocks
received from the processor.
230 Error Block Count
This field contains the total number of block errors
recognized by the module.
231 Port 1 Current Error
For a master port, this field contains the index of the
currently executing command.
232 Port 1 Last Error
For a master port, this field contains the index of the
command with the error.
233 Port 2 Current Error
For a master port, this field contains the index of the
currently executing command.
234 Port 2 Last Error
For a master port, this field contains the index of the
command with an error.
6.2 Verify Master Communications
The Modbus Master commands are setup, now it is time to verify that these
commands are working correctly.
Within the MVI56-MCM module, there are a couple of ways of checking to see if
the commands that have been configured in the previous location are working
correctly.
The most common, and detailed method of checking the communications is
using the MCM.CONFIG.PortX.CmdErrPtr parameter. This parameter will tell you
the individual status of each command that is issued by the module. Another
method is by checking the MCM.STATUS.PrtXErrs location for total commands
issued, responses received, errors, and so on.
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