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MVI69E-MBS ♦ CompactLogix™ Platform
Legacy Mode
Modbus Serial Enhanced Communication Module
User Manual
ProSoft Technology, Inc.
Page 83 of 159
Command Count
0 to 100
(Master mode) Specifies the number of commands to be
processed by the Modbus master port.
Minimum Command
Delay
0 to 32767 ms
(Master mode) Specifies the number of milliseconds to
wait between receiving the end of a slave's response to
the most recently transmitted command and the issuance
of the next command. Use this parameter to place a delay
after each command to avoid sending commands on the
network faster than the slaves can receive them. This
parameter does not affect retries of a command, as retries
are issued when a command failure is recognized.
Cmd Err Pointer
0 to 4900
(Master mode) Internal DB location to place command
error list
Response Timeout
0 to 65535 ms
(Master mode) Specifies the command response timeout
period in 1 ms increments. This is the time that a Master
waits for a response from the addressed slave before re-
transmitting the command (Retries) or skipping to the next
command in the Command List. The value to specify
depends on the communication network used and the
expected response time (plus or minus) of the slowest
device on the network.
Retry Count
0 to 10
(Master mode) Specifies the number of times a command
is retried if it fails.
Error Delay Count
0 to 60000
(Master mode) Specifies the number of poll attempts to be
skipped before trying to re-establish communications with
a slave that has failed to respond to a command within
the time limit set by the
Response Timeout
parameter.
After the slave fails to respond, the master skips sending
commands that should have been sent to the slave until
the number of skipped commands matches the value
entered in this parameter. This creates a sort of
slow poll
mode for slaves that are experiencing communication
problems.
Slave Address
1 to 255
(Slave mode) Modbus Slave address on network.
Bit Input Offset
0 to 3998
(Slave mode) Specifies the offset address into the internal
Modbus database that is to be used with network for
Modbus function 2 commands.
Word Input Offset
0 to 3998
(Slave mode) Specifies the offset address into the internal
Modbus database that is to be used with network for
Modbus function 4 commands.
Output Offset
0 to 3998
(Slave mode) Specifies the offset address into the internal
Modbus database that is to be used with network
requests for Modbus function 1, 5, or 15 commands.
Holding Register
Offset
0 to 3998
(Slave mode) Specifies the offset address in the internal
Modbus database that is to be used with network for
Modbus function 3, 6, or 16 commands.
Inter-character
Timeout
0 to 65535 ms
(Master mode) Specifies a time delay to be added to the
3.5 character time delay used by the module to recognize
the end of a message.
Command Error
Offset
0 to 4998
(Master mode) Internal Database offset location of
command error