Adding a Device on the Modbus Serial IOScanner

Introduction

This section describes how to add a device on the Modbus IOScanner.

Adding a Device on the Modbus IOScanner

To add a device on the Modbus IOScanner, select the Generic Modbus Slave in the Hardware Catalog, drag it to the Devices tree, and drop it on the Modbus_IOScanner node of the Devices tree.

For more information on adding a device to your project, refer to:

• Using the Hardware Catalog

• Using the Contextual Menu or Plus Button

NOTE: The variable for the exchange is automatically created in the %IWx and %QWx of the Modbus Serial Master I/O Mapping tab.

Configuring a Device Added on the Modbus IOScanner

To configure the device added on the Modbus IOScanner, proceed as follows:

Step	Action
1	In the Devices tree, double-click Generic Modbus Slave. Result: The configuration window is 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).

To configure the Modbus Slave Channels, proceed as follows:

Step	Action
1	Click the Modbus Channels tab:
2	Click the Add Channel button:
3	Configure an exchange: In the area Channel, you can add the following values: Name: Enter a name for your channel. Access Type: Choose the exchange type: Read or Write or Read/Write multiple requests. See Access Types. Trigger: Choose the trigger of the exchange. It can be CYCLIC with the period defined in Cycle Time (ms) field, started by a RISING EDGE on a boolean variable (this boolean variable is then created in the Modbus Master I/O Mapping tab), or by the Application. Comment: Add a comment about this channel. In the area READ Register (if your channel is Read or Read/Write one), you can configure the `%MW` to be read on the Modbus slave. Those are mapped on `%IW` (see Modbus Master I/O Mapping tab): Offset: Offset of the `%MW` to read. 0 means that the first object that is read is `%MW0`. Length: Number of `%MW` to be read. For example, if Offset = 2 and Length = 3, the channel reads `%MW2, %MW3` and `%MW4`. Error Handling: choose the behavior of the related `%IW` in case of loss of communication. In the area WRITE Register (if your channel is Write or Read/Write one), you can configure the `%MW` to be written to the Modbus slave. Those are mapped on `%QW` (see Modbus Master I/O Mapping tab): Offset: Offset of the `%MW` to write. 0 means that the first object that is written is `%MW0`. Length: Number of `%MW` to be written. For example, if Offset = 2 and Length = 3, the channel writes `%MW2, %MW3` and `%MW4`.
4	Click OK to validate the configuration of this channel. NOTE: You can also: Click the Delete button to remove a channel. Click the Edit button to change the parameters of a channel. Result: The configured channels are displayed:

To configure your Modbus Initialization Value, proceed as follows:

Step	Action
1	Click the Modbus Slave Init tab:
2	Click New to create a new initialization value: The Initialization Value window contains the following parameters: Access Type: Enter the exchange type: Write requests. Register Offset: Register number of register to be initialized. Length: Number of `%MW` to be read. For example, if 'Offset' = 2 and 'Length' = 3, the channel reads `%MW2, %MW3` and `%MW4`. Initialization Value: Value the registers are initialized with. Comment: Add a comment about this channel.
3	Click OK to create a new Initialization Value. NOTE: You can also: Click Move up or Move down 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.

Step

Action

1

Click the Modbus Slave Init tab:

2

Click New to create a new initialization value:

The Initialization Value window contains the following parameters:

Access Type: Enter the exchange type: Write requests.
Register Offset: Register number of register to be initialized.
Length: Number of %MW to be read. For example, if 'Offset' = 2 and 'Length' = 3, the channel reads %MW2, %MW3 and %MW4.
Initialization Value: Value the registers are initialized with.
Comment: Add a comment about this channel.

3

Click OK to create a new Initialization Value.

NOTE: You can also:

Click Move up or Move down 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.

To configure your Modbus Master I/O Mapping, proceed as follows:

Step	Action
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 the browse button [...] and chose a variable with the Input Assistant.
3	For more information on I/O mapping, refer to EcoStruxure Machine Expert Programming Guide.

Step

Action

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 the browse button [...] and chose a variable with the Input Assistant.

3

For more information on I/O mapping, refer to EcoStruxure Machine Expert Programming Guide.

Access Types

This table describes the different access types available:

Function	Function Code	Availability
Read Coils	1	ModbusChannel
Read Discrete Inputs	2	ModbusChannel
Read Holding Registers (default setting for the channel configuration)	3	ModbusChannel
Read Input Registers	4	ModbusChannel
Write Single Coil	5	ModbusChannel Initialization Value
Write Single Register	6	ModbusChannel Initialization Value
Write Multiple Coils	15	ModbusChannel Initialization Value
Write Multiple Registers (default setting for the slave initialization)	16	ModbusChannel Initialization Value
Read/Write Multiple Registers	23	ModbusChannel