ProSoft Technology MVI71-MCM - Manual (Page 87)

Reference MVI71-MCM ♦ PLC Platform
Modbus Communication Module
ProSoft Technology, Inc. Page 87 of 111
December 28, 2007
Offset Register Content Description
30 7630 Port 1 Last Error For a slave port, this field contains the value of the
last error code returned. For a master port, this
field contains the index of the command with an
error.
31 7631 Port 2 Current
Error For a slave port, this field contains the value of the
current error code returned. For a master port, this
field contains the index of the currently executing
command.
32 7632 Port 2 Last Error For a slave port, this field contains the value of the
last error code returned. For a master port, this
field contains the index of the command with an
error.
5.6 MVI71-MCM Configuration Data Definition
This section contains listings of the MVI71-MCM module's database related to
the module's configuration. This data is available to any node on the network and
is read from the PLC processor when the module first initializes.
5.6.1 Backplane Setup
Write
Block
Offset Internal
Database
Register Content Description
1 5000 Write
Start Reg This parameter specifies the starting register in the module
where the data transferred from the processor will be
placed. Valid range for this parameter is 0 to 4999.
2 5001 Write Reg
Count This parameter specifies the number of registers to transfer
from the processor to the module. Valid entry for this
parameter is 0 to 5000.
3 5002 Read
Start Reg This parameter specifies the starting register in the module
where data will be transferred from the module to the
processor. Valid range for this parameter is 0 to 4999.
4 5003 Read Reg
Count This parameter specifies the number of registers to be
transferred from the module to the processor. Valid entry for
this parameter is 0 to 5000.
5 5004 Backplan
e Fail This parameter specifies the number of successive transfer
errors that must occur before the communication ports are
shut down. If the parameter is set to zero, the
communication ports will continue to operate under all
conditions. If the value is set larger than 0 (1 to 65535),
communications will cease if the specified number of failures
occur.
6 5005 Error
Status
Pointer This parameter specifies the register location in the
module's database where module status data will be stored.
If a value less than zero is entered, the data will not be
stored in the database. If the value specified in the range of
0 to 4940, the data will be placed in the user data area.