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4. Software Implementation of the Gateway
4.1.2. Configuring the Motor Starters
Each motor starter should be configured as follows:
Protocol: Modbus RTU slave Start bits 1
Modbus address 1 to 8 Parity None
Bitrate 19,200 bits/s Parity bit 0
Data bits 8 Stop bits 1
When using a TeSys U motor starter with a Modbus communication module (LULC031 module), the
configuration parameters for the RS485 connection are automatically detected, only the Modbus address needs
to be configured.
4.1.3. Modbus cycle time
The LUFP9 gateway’s default configuration sets a cycle time of 300 ms on Modbus commands for each of the
8 TeSys U motor starters.
4.1.4. Managing degraded modes
The default management for degraded modes is described below, but it takes no account of the PLC used or of
the DeviceNet scanner. Please see chapter 6.11.2.1 Managing Degraded Modes, page 65, if you would like to
change the way that degraded modes for one or more Modbus commands are managed.
Event
Desired behaviour DeviceNet PLC:
CPU stop or failure
Disconnection of
the upstream
DeviceNet network
Failure of the
LUFP9 gateway
Disconnection
of the downstream
Modbus RTU
network
Reset Yes
Outputs
Hold
Depending on the
configuration
of the DeviceNet
master ——
Depending on the configuration of the
TeSys U motor starters (1)
Reset Yes
Inputs
Hold
—— Depending on the configuration
of the DeviceNet master ——
(1) The desired behaviour with regard to the outputs should be directly configured on each of the TeSys U motor starters.
You can also read the user manuals for your master and your DeviceNet scanner to obtain further details about
how to process degraded modes.