ProSoft Technology MVI71-MCM - Manual (Page 89)

Reference MVI71-MCM ♦ PLC Platform
Modbus Communication Module
ProSoft Technology, Inc. Page 89 of 111
December 28, 2007
Write
Block
Offset Internal
Database
Register Content Description
20 5023 Use CTS
Line
This parameter specifies if the CTS modem control line is to
be used. If the parameter is set to 0, the CTS line will not be
monitored. If the parameter is set to 1, the CTS line will be
monitored and must be high before the module will send
data. This parameter is normally only required when half-
duplex modems are used for communication (2-wire).
21 5024 Slave ID This parameter defines the virtual Modbus slave address for
the internal database. All requests received by the port with
this address are processed by the module. Verify that each
device has a unique address on a network. Valid range for
this parameter is 1 to 255 (247 on some networks).
22 5025 Bit Input
Offset
This parameter specifies the offset address in the internal
Modbus database that is to be used with 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.
23 5026 Word
Input
Offset
This parameter specifies the offset address in the internal
Modbus database that is to be used with network request
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.
24 5027 Bit Output
Offset
This parameter specifies the offset address in the internal
Modbus database that is to be used with 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
correspond to register 100 in the database.
25 5028 Holding
Reg Offset
This parameter specifies the offset address in the internal
Modbus database that is to be used with network requests
for Modbus function 3, 6, or 16 commands. For example, if
a value of 50 is entered, a request for address 0 will
correspond to the register 50 in the database.
26 5029 Command
Count
This parameter specifies the number of commands to be
processed by the Modbus master port.
27 5030 Minimum
Command
Delay
This parameter specifies the number of milliseconds to wait
between issuing each command. This delay value is not
applied to retries.
28 5031 Command
Error
Pointer
This parameter sets the address in the internal Modbus
database where the command error will be placed. If the
value is set to -1, the data will not be transferred to the
database. The valid range of values for this parameter is -1
to 4999.
29 5032 Response
Timeout
This parameter represents the message response timeout
period in 1-millisecond 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.