Modbus TCP Slave(Server)

Supported devices and requirements

	Description	Notes
Distributor	MODICON
Device	Any MODBUS TCP supported devices
Comm. Module
Comm. Type	Ethernet
Protocol	MODBUS TCP
Driver Description	MODICON Modbus TCP Slave

MODICON MODBUS TCP SLAVE

After assigning a name to the MODBUS IO device, you will see the communication configuration window. In this window, there are 2 different tabs to configure: Setting Data and Comm. Port Setting.

Item	Description
Setting Data	In this tab, the user can set the servers and their related settings.
Setting Server Station	Pressing the button will open the popup window to set a server.

Item	Description
Name	This cannot be modified.
Description	Describes the station.
Unit ID	Sets the unit ID of the server.
Swapping for data	Swaps the bytes if necessary.

Setting IO Data

Pressing [Setting IO Data] while a station is selected will bring up the R/W data Registration window as shown below. The user can start matching the tags from servers and the MODBUS addresses.

Data Types	Type	R/W	Identifier	Available Addresses	Function Code
Coil Register(Status)	Digital	Read/Write	0	1 ~ 5000	1(5, 15)
Holding Register	Analog	Read/Write	4	1 ~ 10000	3(6, 16)

Identifier means that the tag’s address in UltimateAccess Web must start with it. For example, using Coil Status and its address 102 means that the address is 00102.

Function code means the MODBUS protocol’s command code used to read the corresponding data type in this I/O driver. The code in the brackets are used to write the corresponding data type.

1. Add data

Item	Description
Tag Name	Decides a tag to map to a Modbus address. String tags are not available for Coil types.
Modbus Address	Assigns the address. The identifier is automatically assigned depending on the currently opened tab.
Data Size (word base)	Sets the amount of word data to read starting from the set Modbus address.

2. Edit data

This button edits the selected data.

3. Delete data

This button deletes the selected data.

Comm. Port Setting

Item	Description
Port	Sets the port number for the communication. The default is 502.
Local Address	Sets the IP address of the UltimateAccess Web-installed system.

Error Codes

MODBUS ErrorNo	Description
0x01	Wrong function code
0x02	Wrong address requested
0x03	Wrong data
0x04	Wrong response frame
Additional error codes for UltimateAccess Web
0x10	Wrong header of the frame
0x11	Wrong unit ID
0x12	Wrong frame length
0x13	Internal server error