Select [Tools] – [Data Server] – [MODBUS Slave] or select [Modbus Slave] in the project tree to bring up the Modbus Slave configuration window as shown below.
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Item | Description |
| Adds tags a tag to the Coils and Holding Register areas when they are selectedselected area. You cannot add tags when the ‘Communication Channel’ folder is selected. If you select an existing communication channel and press this button, you can only add string tags. |
| Edits the selected tag. |
| Deletes the selected tag. |
| Adds a communication channel for MODBUS Modbus Slave. This button is enabled only when you select the ‘Communication Channel’ folder. You can register up to 3 channels. |
| Edits the selected communication channel. |
| Deletes the selected communication channel |
 | Communication channels are registered here. The added channels will be displayed beneath the 'Communication Channel' folder icon. |
 | Shows the tags in the Coils area and allows new tags to be registered. |
 | Shows the tags in the Holding Register and allows new tags to be registered. |
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Item | Description |
Slave Type | Selects the MODBUS Modbus Slave type. You can select MODBUS Modbus RTU or MODBUS Modbus TCP. When you select MODBUS Modbus TCP, only Unit No. and Socket No. can be configured. |
Unit No. | Assigns the Slave’s unit number. |
Socket No. (TCP only) | Assigns the Slave’s socket port number. The default socket is 502. It is recommended to that you only change the socket number when a communication failure occurs. |
PORT | Assigns the local (Xpanel) COM port to use MODBUS Modbus RTU Slave. |
Baud Rate | Configures the baud rate (300bps ~ 256,000bps). |
MODE | Selects one of the following communication modes: RS232, RS422, RS485. |
Parity | Determines whether to use an even, odd, or no parity bit for error checking. |
Data Bits | Determines the number of data bits per packet. You can select between 5 and 8bits8 bits. If the data contains Korean characters, please select 8 bits to avoid errors. |
Stop Bit(s) | Determines the number of stop bits between frames. |
RTS/CTS | Determines whether to use RTS/CTS (Request To Sent/Clear To Send) or not. |
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Item | Description |
Modbus Address | Assign a MODBUS Modbus address for the device address or tag. In the coils area, valid Modbus addresses range from 00001 to 09999. The first digit “0” indicates the Modbus function code, which in this case is used for to read/write bit data. E.g.) 00001, 00002 … 05000 … 09998, 09999 |
Address | Assigns a device address for the current MODBUS Modbus Slave address. You may only register bit data. Press the |
TagName | Assigns a virtual tag for the current MODBUS Modbus Slave address. You may only use digital tags in the coils area. Press the |
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Item | Description |
Modbus Address | Assign a MODBUS Modbus address for the device address or tag. In the holding register area, valid Modbus addresses range from 40001 to 49999. The first digit “4” indicates the Modbus function code, which in this case is used for to read/write word (16-bit) data. E.g.) 40001, 40002 … 45000 … 49998, 49999 |
Address | Assigns a device address for the current MODBUS Modbus Slave address. You may only register word or string data. Press the |
TagName | Assigns a virtual tag for the current MODBUS Slave address. You may only use analog and string tag tags in the holding register area. Press the |
| If a tag or device address which is assigned to the Holding Register has a data type with multiple words (e.g. UINT32, INT32, Float, etc.) or string data, the corresponding word addresses will be allocated automatically. Example: UINT32 data is assigned to Holding Register address 1. Then, Holding Register addresses 1 and 2 will be assigned for the UINT32 data. |
When you assign a unique device address to a MODBUS Slave address, a real tag will be created in the database with the corresponding information. The device name and station name will be the group tags, and the child tag will be registered within the nested group tags. In the example shown below, the full tag names are “IO_DEVICE.ST_STATION.Y00_B“ and “IO_DEVICE.ST_STATION.D00_W“.
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