Remote I/O module 16 DI
AL4042
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9.3 ModbusTCP
9.3.1 Integrating a device into a Modbus TCP project
The device offers the functionality of a Modbus TCP server (independent mode). The user can
integrate the device into a Modbus TCP project via the profile of a generic Modbus TCP slave.
The device can be configured via the Modbus registers.
9.3.1.1 Example: Integrating a device into a CODESYS project
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Familiarise yourself with the Modbus Configurator function in the CODESYS help.
Task: Integrate the device into a CODESYS project.
Available hardware:
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SmartPLC AC14 DL (Modbus TCP Master)
•
Device AL4042(Modbus TCP Slave)
Solution:
Create a Modbus TCP master
Requirements:
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CODESYS project with AC14 DL was created.
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In the device tree: Right click on the node [X8 (Ethernet)].
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The context menu appears.
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Select the menu item [Add device…].
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A dialogue window appears.
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Select the device profile [Modbus_TCP_Master].
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Click on [Add device].
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CODESYS adds the Modbus TCP master as a sub-node of the interface [X8 (Ethernet)] to the
project.
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SmartPLC AC14 DL can be configured as TCP Master mode.
Add the device as a Modbus TCP slave
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In the device tree: Right click on the node [X8 (Ethernet)] > [Modbus_TCP_Master].
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The context menu appears.
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Select the menu item [Add device…].
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A dialogue window appears.
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Select the device profile [Modbus_TCP_Slave].
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Enter AL4042 as the name.
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Click on [Add device].
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CODESYS adds the device to the project as a sub-node of [Modbus TCP Master].
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The device can be configured as a Modbus TCP slave.
