MVI56E-MCM ♦ ControlLogix Platform Reference
Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 157 of 209
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.
This parameter specifies the number of times a
command will be retried if it fails. If the Master Port
does not receive a response after the last retry, the
Slave devices communication will be suspended
on the port for Error Delay Counter scans.
This parameter 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 will skip 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.
6.5.4 Port 1 Commands
This set of registers contains the parameters for
the first command in the Master command list.
Refer to Master Command Configuration (page
39).
Note: To use up to 325 commands, your MVI56E-MCM module needs to have firmware version
3.01 or higher, and your MVI56E-MCM Add-On Instruction needs to be version 2.8 or higher.
Earlier versions support up to 100 commands.
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