1

In the Devices tree, double-click Generic_Modbus_Slave.

Result: The configuration window will be displayed.

2

Enter a Slave Address value for your device (choose a value from 1 to 247).

3

Choose a value for the Response Timeout (in ms).

1

Click the Modbus Slave Channel tab:

2

Click the Add Channel button:

3

Configure the exchange:

In the field Channel, you can add the following values:

oChannel: Enter a name for your channel.

oAccess Type: Choose the exchange type: Read or Write or Read/Write multiple registers.

oTrigger: Choose the trigger of the exchange. It can be either CYCLIC with the period defined in Cycle Time (ms) field or started by a RISING EDGE on a boolean variable (this boolean variable is then created in the 'Modbus Master I/O Mapping' tab).

oComment: Add a comment about this channel.

In the field READ Register (if your channel is a Read or a Read/Write one), you can configure the %MW to be read on the Modbus slave. These registers will be mapped on %IW (see 'Modbus Master I/O Mapping' tab):

oOffset: Offset of the %MW to read. 0 means that the first object that will be read will be %MW0.

oLength: Number of %MW to be read. For example if 'Offset' = 2 and 'Length' = 3, the channel will read %MW2, %MW3 and %MW4.

oError Handling: choose the behavior of the related %IW in case of loss of communication.

In the field WRITE Register (if your channel is a Write or a Read/Write one), you can configure the %MW to be written to the Modbus slave. These registers will be mapped from %QW (see 'Modbus Master I/O Mapping' tab):

oOffset: Offset of the %MW to write. 0 means that the first object that will be written to will be %MW0.

oLength: Number of %MW to be written. For example if 'Offset' = 2 and 'Length' = 3, the channel will write %MW2, %MW3 and %MW4.

4

Click the Delete button to remove a channel.

Click the Edit button to change the parameters of a channel.

5

Click OK to validate the configuration of this channel.

1

Click the Modbus Slave Init tab:

2

Click New to create a new initialization value:

The Initialization Value window contains the following parameters:

oAccess Type: Choose the exchange type: Write multiple registers.

oRegister Offset: Register number of register to be initialized.

oLength: Number of %MW to be written. For example if 'Offset' = 2 and 'Length' = 3, the channel will write %MW2, %MW3 and %MW4.

oInitialization Value: Value the registers are initialized with.

oComment: Add a comment about this channel.

3

Click Move up to change the position of a value in the list.

Click Delete to remove a value in the list.

Click Edit to change the parameters of a value.

4

Click OK to create a new Initialization Value.

1

Click the Modbus Master I/O Mapping tab:

2

Double-click in a cell of the Variable column to open a text field.

Enter the name of a variable or click on the browse button [...] and chose a variable with the Input Assistant.

3

For more details about I/O mapping, refer to the EcoStruxure Machine Expert Programming Guide.