ProSoft Technology MVI94-MCM-MHI - Manual (Page 60)

Diagnostics and Troubleshooting MVI94-MCM ♦ Flex I/O Platform
User Manual Serial Communications Modbus Communication Module
Page 60 of 109 ProSoft Technology, Inc.
March 29, 2011
4.4 Error/Status Data
The module error/status data areas are discussed in this section. The module
contains three areas related to this data. The user defines the location of two of
these data sets in the virtual Modbus database of the module. The error/status
data contains module data, the command error list data set contains the errors
associated with the command list and the slave status list contains the current
communication status of each slave on the master port.
4.4.1 Error and Status Data Table
The error/status data table is located at the virtual Modbus address assigned by
the user. If the address is set to -1 or the frequency parameter is set to 0, the
data will not be placed in the database. It will only be available through the
Configuration/Debug Port. If valid address and frequency values are assigned,
the module will update the Modbus data area.
The data area will be initialized with zeros whenever the processor is initialized.
This occurs during a cold-start (power-on), reset (reset push-button pressed) or a
warm-boot operation (commanded or loading of new configuration).
The data area is a 22-word register block. The structure of the block is shown in
the following table.
Word Description
System Information
0
Program Cycle Counter
1 Product Name (ASCII) = MCM
2
3 Revision (ASCII)
4
5 Operating System Rev (ASCII)
6
7 Production Run Number (ASCII)
8
Modbus Port
9
Number of Command Requests
10 Number of Command Responses
11 Number of Command Errors
12 Number of Requests
13 Number of Responses
14 Number of Errors Received
15 Number of Errors Sent
Block Transfer Statistics
16
Total Number of Read Block Operations
17 Total Number of Write Block Operations
18 Total Number of Blocks Parsed
19 Total Number of Event Blocks Received
20 Total Number of Command Blocks Received
21 Total Number of Block Transfer Errors
Counter Values are initialized to 0 at power up.