Adding Modbus Devices Through Webpages - EcoStruxure Panel Server Cybersecurity Guide

Presentation

Modbus TCP/IP and Modbus-SL devices can be added to or removed from the EcoStruxure Panel Server system through the Panel Server webpages.

Discovery of Modbus TCP/IP Devices With a Selective List

In the Settings > Modbus devices > Device addition > Modbus TCP/IP webpage, in the Discovery > Selective list section, create a list of devices to be discovered by entering the IPv4 address for each device. The default port is 502 (see Ethernet Communication) and the default unit ID is 255 (see Modbus Gateway Function).

NOTE: Discovery of Modbus TCP/IP devices using an IPv6 address is not supported.

During device discovery the Panel Server uses, in priority order:

A custom device model, if applicable (the most recently modified custom device model if more than one apply)
A built-in model

NOTE: Delete the device and manually discover it using a specific custom model if the choice of custom model used is not appropriate.

Result: The Discovery result table shows the following information for each device discovered on the Modbus TCP/IP network:

Picture (built-in device models)
Device name
IP address
Port
Unit ID

The device is displayed in the Modbus devices section.

Manual Addition of Modbus TCP/IP Devices

In the Settings > Modbus devices > Device addition webpage, in the Modbus TCP/IP > Manual addition section, enter the following information for each device:

IP address
Port
Unit ID
Device

NOTE: Manual addition of Modbus TCP/IP devices using an IPv6 address is not supported.

Result: Once the device is discovered, it is displayed in the Modbus devices section.

To manually add a Modbus TCP/IP device applying a custom device model from the drop-down list, select Settings > Modbus Devices > Device addition > Modbus TCP/IP > Manual Addition then:

Type the values for
- IP address
- Port
- Unit ID
Select the custom device model name in Device.

Discovery of Modbus-SL Devices With a Selective List

In the Settings > Modbus devices > Device addition > Modbus serial webpage, in the Discovery > Selective list section, enter the list of Modbus addresses (1–254) for which the devices must be discovered.

NOTE: If no addresses are entered, discovery is done for addresses 1 to 10.

During device discovery the Panel Server uses, in priority order:

A custom device model, if applicable (the most recently modified custom device model if more than one apply)
A built-in model

NOTE: Delete the device and manually discover it using a specific custom model if the choice of custom model used is not appropriate.

Result: The table shows the following information for each device discovered on the Modbus-SL network:

Picture
Device name
Virtual server ID (Server ID)

The device is displayed in the Modbus devices section.

Manual Addition of Modbus-SL Devices

In the Settings > Modbus devices > Device addition > Modbus Serial > Manual addition > Server ID webpage, enter the physical server ID of the device to be added and select the device type.

Result: Once the device is discovered, it is displayed in the Modbus devices section.

To manually add a Modbus Serial device applying a custom device model from the drop-down list, select Settings > Modbus Devices > Device addition > Modbus Serial > Manual Addition then:

Type the value for Physical server ID.
Select the custom device model name in Device.

Addition of Modbus-SL Devices Connected to a Child Panel Server Gateway

To add Modbus-SL devices connected to a child/downstream Panel Server (see example), navigate to Settings > Modbus devices > Device addition > Modbus TCP/IP > Manual addition > IP address.

Enter:

The IP address of the child/downstream Panel Server
The virtual server ID of the Modbus device in Unit ID
The Modbus device type

Result: Once the device is discovered, it is displayed in the Modbus devices section.

Modbus Registers Read

To troubleshoot the addition of Modbus devices, navigate to the webpage Settings > Modbus devices > Modbus registers read. Fill in the Modbus device identification parameters described in the following table and click the Read registers button.

NOTE: When a device discovery is in progress, you cannot use the Modbus register reading function.

Result: A table is displayed containing the list of register numbers and the register content in the selected format.

NOTE: When the Panel Server is configured in Reverse gateway mode, the reading register function is supported for Modbus TCP/IP devices only.

Parameter	Availability by device		Description
Device Type	Modbus Serial	Modbus TCP/IP	Select from the list either Modbus Serial or Modbus TCP/IP. Other parameters displayed depend on the device type selected.
Device ID	✔	-	Enter the virtual device ID you want to read registers from. Value range 1–254.
IP address	-	✔	Enter the address of the TCP network.
Port	-	✔	Enter the port of the device
Unit ID	-	✔	Enter the ID of the device. Value range 1–255.
Function code	✔	✔	Select from the list the Modbus function to use to read the registers of the identified device: FC01 Read coils status FC02 Read inputs status FC03 Read holding registers FC04 Read input registers
Starting register	✔	✔	Enter the number of the first register to be read. For function codes FC01 and FC02, use the following calculation to specify the bit number: (Register number - 1) * 16 + (bit offset+1) where offset is the bit order (from 0 to 15)
Number of registers	✔	✔	Enter the total number of consecutive registers to be read.
Result format	✔	✔	For function codes FC03 and FC04, select from the list the format to display the results: Hexadecimal (default format) Binary Signed integer 16 Unsigned integer 16 The result of function codes FC01 and FC02 is 1 when true and 0 when false.