MODBUS-TCP to Ethernet IP gateway connection air compressor configuration example

This case is a configuration case of using the Ethernet/IP to Modbus-TCP gateway of JM-EIP-TCP to connect Omron PLC and air compressor in industrial field. Equipment used: Omron PLC, JM-EIP-TCP gateway,

Electrical connections for ETHERNET/IP

ETHERNET/IP uses the standard T568B connection method and supports direct connection and crossover connection, as shown in the figure above. ETHERNET/IP only needs to connect the four signal lines 1, 2, 3, and 6 of Ethernet to achieve communication. Users need to pay attention to the good connection of the shielding layer of the Ethernet cable.

Open and configure the JM-EIP-TCP gateway software. Open the GW Config software, select "Modbus Configuration", and click OK to enter the settings interface.

1. Double-click "Modbus Slave" in the device list on the right side of the software to add a slave station to the Modbus bus of this master station. After adding, you can see all stations on the Modbus bus in the main window of the software, as shown below:

2. Double-click the "Modbus Master" icon in the main window to set the operating parameters of the Modbus bus and the characteristics of the gateway working as a Modbus master:

3. Slave status monitoring: If the slave status monitoring function is turned on, the gateway will add 4 bytes (32 bits) at the end of all communication data to identify whether the corresponding 32 slaves are online.

4. Double-click a "Modbus Slave" in the main window to set the message of the slave.

5. As shown in the figure below, 1 write coil, 1 read coil, 1 write register, and 1 read register are added to slave station 1. For each message, the user can modify the starting address and data length in the table.

6. After the configuration is completed, the user double-clicks "Modbus Master" again, clicks the "Address Table" button, and the Modbus slave data list pops up. This list shows all the messages configured by the user, which can help the user to map the data address.

7. After the user completes the Modbus message configuration, the configuration can be downloaded to the JM-EIP-TCP gateway. Download configuration

8. If the user needs to modify the IP address of the gateway LAN port, click the menu bar "Settings - Communication Settings - Modify Device IP" to download the network port settings, as shown below. The user clicks "Tools - Download",

9. Copy the EDS file to the corresponding folder of the Omron software

10. First add the global variables of the gateway:

11. Add input and output data according to actual needs. The following example adds 14 bytes of input data and 2 bytes of output data:

12. Set the gateway parameters and click the "Add" button.

13. Add the device on the connection page, as shown below:

14. After adding, the following figure is shown. At this time, all settings are completed. Note: The target variable input uses 101, and the output uses 100. The connection type is set to "Point to Point".

15. Compile and download the Omron PLC program.

16. Users can monitor the data sent by the JM-EIP-TCP gateway through the monitoring table, as shown in the figure below. Communication has been successful