ProSoft Technology MVI46-MBP - Manual (Page 67)

Reference MVI46-MBP ♦ SLC Platform
Modbus Plus Communication Module
ProSoft Technology, Inc. Page 67 of 101
February 19, 2008
DB
Address Modbus
Address Parameter Description
4375 44376 Input File Update
Timing
This parameter is not used by the MVI46-MBP
module as the In File data is updated with each
new input image sent to the processor.
4376 44377 Global In Update
Timeout
This value defines the timeout period (0 to 65535
milliseconds) for receiving Global Input Data from
other nodes on the network. After the timeout
period has been exceeded, the Timeout Error will
be returned in the Global In Update Status data
set. A value of 0 will result in the default value of
1000 milliseconds (1 second).
4377 44378 Spare Not used
4378 44379 Spare Not used
4379 44380 Spare Not used
4380 44381 Number of Nodes
Defined in the
Device Definition
File
This value specifies the number of devices to
consider in the Device Definition Table. Valid
range for this parameter is 0 to 64 inclusive. These
node definitions are used by several modes of
operation of the module.
4381 44382 Number of Master
Commands
This parameter specifies the number of
commands to be processed in the Master
Command List. The module will only process this
many commands starting with the first one in the
list. If the value is set to zero, the Master
Command Mode will be disabled. Valid values for
this parameter are 0 to 200.
4382 44383 Number of Master
Data Paths
Maximum
This value defines the number of Master Data
Paths that will be made available to the module's
Master Mode Driver by the Modbus Plus Chipset.
Valid values for this parameter are 1 to 8. A value
of zero will result in the default value of 8.
4383 44384 Master Command
Timeout Preset
This parameter defines the number of milliseconds
(0 to 65535) to wait for a response to a master
command issued by the module on the network. If
a timeout condition exists for a command, it will be
reflected in the Master Command List Status data
area. A value of 0 will result in a value of 1000 (1
second) for the parameter.
4384 44385 Read Block Start
Register
This parameter specifies the module's start
address where data will be read from and
transferred to the processor. Valid values for this
parameter are 0 to 3999. This is a read-only value
and can only be set in the processor.
4385 44386 Read Block
Register Count
This parameter specifies the number of registers
to transfer from the module's database to the
processor. This is a read-only value and can only
be set in the processor.
4386 44387 Read Block
Maximum Count
This read-only value specifies the number of
blocks of 200-word data are to be transferred from
the module to the processor.
4387 44388 Write Block Start
Register
This read-only parameter specifies the starting
register in the module's database where data will
be transferred from the processor to the module.