This document describes the MODBUS communication driver for XpanelCanvas. This driver supports the RTU (serial) version of the MODBUS protocol.
Communication Setup:
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Canvas
I/O Device Configuration
| To create a new device, select [Tools] → [I/O |
Device Editor]. Click the |
I/O to add a new device, then select a “Serial” [Connection Type] and a “Modbus RTU” [Device Type].  Device Name: Give a device name. This name will be used in the tag database, |
accompanid by the ‘Station Name’. |
Select a device type
I/O Device Settings
| Once the connection type, device name, and device type have been assigned, the [I/O Device Editor] window populates with the default settings for the selected communication protocol.   After selecting the |
correct [Connection Type] and [Device Type], match the remaining settings to the target I/O device’s communication settings. | |
Station | In this window, |
Create a station
Move to the [Station] tab of the ‘Serial Communication Configuration’ dialog box. In this dialog box, connected PLC stations can be configured and registered to the Xpanel.
Each field can be configured with the following rules:
Station Name: Give a name to the PLC. This name will be used in the tag database, accompanied by the ‘Device Name’.
Station Type: Choose the type of connected PLC (Modbus RTU, Multi Write CMD, Max Block Read).
Network ID: N/A
Station No:Specify a decimal number between 1 and 247. This must match the station number of the PLC.See the Communication Configuration section for more information about the remaining parametersusers can assign a Station Name and ID for the target I/O Device.  |
Communication Settings: PLC
Comm. Module | If using one of the following PLC modules to communicate with Xpanel, the card settings must be configured in CICON as shown below:
Note that the [CH 1] tab is for usage with RS232 connections, while the [CH 2] tab is for usage with RS485 connections. All communication parameters must match the settings chosen during the I/O device configuration in Canvas. Once the correct parameters have been entered, press the [Write] button while online with the PLC to update the communication parameters. |
CPU built-in Comm. port | If using a built-in CPU (PLC) serial port to communicate with Xpanel, the channel settings must be configured in CICON as shown below: This connection option is available with the following models:
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Address Notation
The following table shows the list of valid address ranges and MODBUS function codes for each address area.
Area | Symbol | Analog Tag | Digital Tag | Read | Write |
Coil | 0 |
| 000001 - 0299991 | 1 | 5 |
Input | 1 |
| 100001 - 129999 | 2 |
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Holding Register | 4 | 400001 - 429999 |
| 3 | 6, 162 |
Input Register | 3 | 300001 - 329999 |
| 4 |
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Notes:
The symbol character (0, 1, 3, or 4) must be placed in the first position of the address string. The address number follows the symbol character.
The symbol character does not behave as a number. For example, 400100 and 40100 designate the same memory area (holding register 100).
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Communication Cable Wiring
XPANEL COM/CPM2 RS-232C |  |
XPANEL COM1 RS-422/485 |  |
The above picture shows the RS-232C and RS-422/485 ports of the Xpanel. Refer to the manual of your device for signal descriptions.
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