ProSoft Technology MVI69E-MBS - Manual (Page 56)

MVI69E-MBS Configuration MVI69E-MBS ♦ CompactLogix Platform
User Manual Communication Module
Page 56 of 162 ProSoft Technology, Inc.
January 6, 2014
Additional Configuration Parameters (As a Master)
The Type parameter must be “Master” to configure these parameters. See
“Configuration Parameters Common to Master and Slave” on page xx.
Parameter Value Description
Response
Timeout 0 to 65535
milliseconds Specifies the command response timeout period in 1
millisecond increments. This is the time that a port configured
as 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 Specifies the number of times a command is retried if it fails.
Minimum
Command
Delay 0 to 32767
milliseconds 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.
You can 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.
Error Delay
Counter 0 to 60000 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.
Inter-character
Timeout 0 to 65535
milliseconds Specifies a time delay in milliseconds to be added to the 3.5
character time delay used by the module to recognize the end
of a message. Certain applications may require validation of
Modbus messages with more than 3.5 character time
between consecutive bytes (example: modem applications).
A value of 0 causes the default end of message delay to be
used
Command Error
Offset -1 to 9998 This parameter sets the address in the module’s database
where the command error data is placed. If the value is set to
-1, the data is not transferred to the database. The valid
range of values for this parameter is -1 to 4899. For example,
if this parameter is configured for 1000, the command errors
are copied to the database as follows:
1000: error code for command 0
1001: error code for command 1
…
An error code of 0 means that the command was successfully
sent (no error).