ProSoft Technology MVI94-MCM-MHI - Manual (Page 95)

MVI94-MCM ♦ Flex I/O Platform Reference
Serial Communications Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 95 of 109
March 29, 2011
5.5 Configuration Form
This section contains configuration forms that will aid in the configuration of the
module. If you design your system before trying to directly implement it, you will
have a greater chance of success. Fill in the configuration form for your
application, then edit the configuration text file.
[Section]/Item Value Range Description
[Module] Configuration header for Module.
Module Name: Up to 80
chars
Name of the module for use on reports. Use this parameter to
identify your module in your system.
Maximum
Register:
1 to 3996 This parameter defines the maximum register in the virtual
Modbus Database. You should size the database for your
application leaving room for expansion in the future.
Requests for registers outside of the range selected will be
returned with an error message.
Error/Status Block
Pointer:
-1 to 3995 This value represents the relative starting position in the
module's internal Modbus database where the Error/Status
data will be stored. The table can be placed anywhere in the
module's data space. The content of the Error/Status table is
updated at the frequency defined in the Error/Status
Frequency. If a value of -1 is set for the parameter, the data
will not be placed in the database.
Error/Status
Frequency:
0 to
65535
This parameter specifies the number of program cycles
between each update of the Error/Status Block data in the
module. If the parameter is set to a value of 0, the data is
never updated.
BT Read Start
Register:
0 to 3995 This parameter specifies the starting register in the internal
Modbus database to write over the backplane.
BT Read Register
Count:
12 to
3996
This parameter specifies the number registers in the internal
Modbus database to write over the backplane. This
parameter computes the number of blocks to transfer from
the module to the backplane. The number of blocks must be
>= 2 for proper backplane data transfer.
BT Write Start
Register:
0 to 3995 This parameter specifies the starting register in the internal
Modbus database to fill with data read over the backplane.
BT Write Register
Count:
12 to
3996
This parameter specifies the number registers in the internal
Modbus database to consider from the read operations over
the backplane. This parameter computes the number of
blocks to transfer from the backplane to the module. The
number of blocks must be >= 2 for proper backplane data
transfer.
Backplane Fail
Count:
0 to
65535
This parameter specifies the number of consecutive
backplane transfer failures before communications is
disabled. If the parameter is set to a value of 0,
communications is not disabled.
Type: 0, 1, 3, 4 This parameter specifies if the port will emulate a Modbus
master device (0), a Modbus slave device without pass-
through (1), a Modbus slave device with pass-through and
data swapping (3), or a Modbus slave device with pass-
through (4).