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6. Configuring the Gateway
6.11. Adding and Setting Up a Modbus Command
6.11.1. With the TeSys U Motor Starters
With TeSys U motor starters, the main use of adding a Modbus command consists of allowing you to control or
monitor additional registers, without having to change the elements in the default configuration. So, the operation
of the periodic and aperiodic communication services remains the same as for the default configuration, unlike
the operations described in the various parts of chapter 6.8 Changing the Periodic Data Exchanged with a
Modbus Slave, page 52.
Instead of adding a command and fully configuring it, it is a better idea to copy one of the two default commands
for TeSys U motor starters, “Read Holding Registers” (reading/monitoring) or “Preset Multiple Registers”
(writing/controlling), and to paste it into the list of Modbus commands for the appropriate node.
To copy an already configured Modbus command, select it, then choose “Copy” from the menu whose name
corresponds to the name of the selected command. Keyboard shortcut: “Ctrl C”. Then continue using one
of the two methods shown below:
a) Select the node corresponding to the Modbus slave for which you wish to add this command (e.g. “TeSys U
n°4”), then choose “Paste” from the menu whose name corresponds to the selected node. A new command is
added after all the other configured commands for this node. The whole of its configuration is identical to that
for the previously copied command.
Keyboard shortcut: “Ctrl V”.
b) Select one of the commands for the node involved, then choose “Insert” from the menu whose name
corresponds to the selected command. A new command is added just before the one which is selected. The
whole of its configuration is identical to that for the previously copied command.
As the new Modbus command and the original Modbus command are identical, you will need to make changes
to the fields
highlighted in blue in one of the two diagrams at the top of the next page, depending on whether
this is the “Preset Multiple Registers” command or a “Read Holding Registers” command (see chapter 6.8
Changing the Periodic Data Exchanged with a Modbus Slave, page 52). The correspondence between the
various elements which appear in these tree structures and the standard Modbus terminology is located to their
right: