Modbus RTU over TCP
Review the following information for setting up and configuring the Modbus RTU over TCP driver.
Compatibility parameter | Compatible items |
|---|---|
Driver type | Ethernet |
When to use | TCP connection to a Modbus server which has one or more Modbus RTU connections |
To set up and configure this device in Litmus Edge, you will need to do the following:
- Step 1: Set up and Configure the PLC Device
- Step 2: Set up the PLC Device in Litmus Edge DeviceHub
- Step 3: Configure the List of Registers
If the device is configured for Ethernet access, find its network parameters. Otherwise, use PLC software on your computer to configure the device for Ethernet access.
Parameter | Value |
|---|---|
Type | Modbus |
Driver | Modbus RTU over TCP |
Network Address | The device address you defined in Step 1 |
Network Port | 502 |
Override Station ID | Select Enable or Disable |
Zero-Based Addressing | Select Enable or Disable |
Request Timeout | Time in milliseconds for the driver to wait for a response from the Modbus server. |
Retry Request Count | Number of times for the driver to retry a request if the Modbus server did not respond to a request. |
Pause Between Retries | Time is milliseconds for the driver to wait before retrying a request. This setting is ignored if Retry Request Count is set to 0. |
Name | Value Types | Address Format | Min Address | Max Address | Description |
|---|---|---|---|---|---|
D | bit | DDDDD | 0 | 65535 | Discrete Input Contacts |
C | bit | DDDDD | 0 | 65535 | Discrete Output Coils |
H | word, int16, int32, uint32, float32, float64 | DDDDD | 0 | 65535 | Analog Output Holding Registers |
I | word, int16, int32, uint32, float32, float64 | DDDDD | 0 | 65535 | Analog Input Registers |
H_bit | bit | DDDDDdd | 0 | 6553515 | Analog Output Holding Registers |
I_bit | bit | DDDDDdd | 0 | 6553515 | Analog Input Re |