ProSoft Technology MVI94-MCM-MHI - Manual (Page 97)

MVI94-MCM ♦ Flex I/O Platform Reference
Serial Communications Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 97 of 109
March 29, 2011
[Section]/Item Value Range Description
Minimum
Command Delay:
0 to
65535
This parameter specifies the number of milliseconds to wait
between issuing each command. This delay value is not
applied to retries.
Command Error
Pointer:
-1 to 3995 This parameter sets the address in the internal Modbus
database where the command error data will be placed. If the
value is set to -1, the data will not be transferred to the
database.
Response
Timeout:
0 to
65535
This parameter represents the message response timeout
period in 1-ms increments. This is the time that a port
configured as a master will wait before re-transmitting a
command if no response is received from the addressed
slave. The value is set depending upon the communication
network used and the expected response time of the slowest
device on the network.
Retry Count: 0 to 10 This parameter specifies the number of times a command will
be retried if it fails.
Error Delay
Count:
0 to
65535
This parameter specifies the number of polls to skip on the
slave before trying to re-establish communications. After the
slave fails to respond, the master will skip commands to be
sent to the slave the number of times entered in this
parameter.
[Modbus Slave] Configuration header for Modbus slave.
Internal Slave ID: 0 to 255 This parameter defines the virtual Modbus slave address for
the internal database. Any requests received by the port with
this address will be processed by the module. Verify that
each device has a unique address on a network.
Bit Input Offset: 0 to 3995 This parameter specifies the offset address in the internal
Modbus database for network requests for Modbus function 2
commands. For example, if the value is set to 150, an
address request of 0 will return the value at register 150 in
the database.
Word Input Offset: 0 to 3995 This parameter specifies the offset address in the internal
Modbus database for network requests for Modbus function 4
commands. For example, if the value is set to 150, an
address request of 0 will return the value at register 150 in
the database.
Output Offset: 0 to 3995 This parameter specifies the offset address in the internal
Modbus database for network requests for Modbus function
1, 5, or 15 commands. For example, if the value is set to 100,
an address request of 0 will return the value at register 100 in
the database.
Holding Register
Offset:
0 to 3995 This parameter specifies the offset address in the internal
Modbus database for network requests for Modbus function
3, 6, or 16 commands. For example, if the value is set to 50,
an address request of 0 will return the value at register 50 in
the database.
Use Guard Band
Timer
Y or N This parameter specifies if the packet Guard Band is to be
used. This is used for multi-drop only.
Guard Band
Timeout
0 to
65535
This parameter specifies the Guard Band time between
packets in multi-drop slave mode. A value of 0 uses the
default time. A value of 1 to 65535 sets the time in
milliseconds.