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Connecting Ethernet/IP VIM to MicroLogix using 1761 NET-ENI
By Adisa Shaljani
Product: DeltaV Virtual IO Module - VIM2

This technical note describes how to connect and configure the VIM Network Gateway to talk to a Rockwell MicroLogix 1500 PLC.

The Rockwell 1761-NET-ENI module is used as an Ethernet/IP to DF1 gateway. The 1761-NET-ENI can also be used to interface to other DF1 devices, e.g., SLC 504 and PLC5/XXl. Configuration parameters for the DeltaV, VIM, and 1761-NET-ENI are shown below:

VIMNet Configuration

Configure the VIM using the VIMNet Explorer as described in the VIM Ethernet/IP manual. Here, a brief example is given.

Step 1:Add an Ethernet/IP VIM placeholder. Select an IP address and subnet mask which matches the requirements of your network.

Step 2: Next, commission the Ethernet/IP VIM placeholder to the physical VIM card. Decommissioned VIM cards appear in the Decommissioned list of the VIMNet Explorer.

Step 3: Select a Card/Port and add a device as shown below:

Step 4: Enter the device address and IP address. Use the IP address of the 1761 NET-ENI here.

Step 5: Upload the configuration to the VIM. Right-click on the VIM placeholder and select "VIM Configuration Upload" as shown below: This completes the VIM configuration.

DeltaV Configuration

The DeltaV configuration starts with auto-sensing the IO cards, where four Programmable Serial Cards are inserted in the designated slots.

Browse the DeltaV I/O tree for the same card where you configured a device in the VIMNet Explorer. In the VIMNet Explorer, we configured a device under C57/P01.

Right-click on Port1 and go to "Properties." Check the checkbox to enable this port as shown below:

Click on the "Advanced" tab. The following dialog will appear. Select "retry count,"message timeout and transmit delay according to their application. Also select the Mode as "Master."

The parameters under the "Communications" tab are not used for the VIM communications. Leave these at their default values.

Configure a Serial Device under the enabled port. Right-click and select the "New Serial Device" menu option. The following dialog will appear:

Specify the description, and select the same device address as configured in the VIMNet Explorer.

Next, configure datasets under the Serial Device. To add a new dataset, right-click on the Serial Device and select the "New Dataset" menu option. The following dialog will appear:

On the "DeltaV" tab select the DeltaV data type.

On the PLC tab the user will select the device data type, starting address (offset), and number of values. In examples below, the device data type is 11, which works for the MicroLogix, SLC 5XX and other Logix PLCs.

The special data tab is used to specify the file type and number. In our example, we are reading from the N7 data file. Special Data 1 is 7 to indicate N file type. And Special Data 2 is 7 for file 7.

Lastly, download the Programmable Serial Driver. This will download the dataset configuration to the VIM.

Once the Programmable Serial Cards have been downloaded, the DeltaV Diagnostics can be used to examine the communication status. If communications are healthy, the users can view the dataset register values as shown below:

The next example shown below is the dataset used to read data from B3 file.

On the "DeltaV" tab, select the DeltaV data type.

On the PLC tab, specify the device data type 11 for the MicroLogix, starting address and number of values to read/write from PLC.

The special data tab is used to specify the file type and number. In our example, we are reading from the B3 data file.

Again, download the Programmable Serial Cards and check the communication status using the DeltaV Diagnostics. The dataset register values can be viewed as shown below:

Next example shown below is the dataset used to read data from F8 file.

On the "DeltaV" tab, the user needs to select the DeltaV data type.

On the PLC tab, specify the device data type 11 for the MicroLogix, starting address and number of values to read/write from the PLC. For floating point datasets, the maximum number of values is 50.

The special data tab is used to specify the file type and number. In our example, we are reading from the F8 data file.

Lastly, view the dataset register values from the DeltaV Diagnostics as shown below:

PLC Configuration

Use the RSLogix 500 to configure the channel properties. We will connect the 1761-NET-ENI to the MicroLogix Ch0 or Ch1 ports via RS-232. If connecting to Ch0, use the prefabricated cable 1761-CBL-AM02. Or if connecting to Ch1, use the prefabricated cable 1761-CBL-PM02. Both cables are available from Rockwell.

Configure the MicroLogix 1500 channel communication parameters as shown below:

ENI Utility Configuration

Use the Rockwell ENI Utility to configure the ENI module. Connect a COM port in your PC to the ENI module using the 1761-CBL-PM02 cable. This cable has a 9-pin D connector on one end, and a round mini-Din connector on the other. The round mini-Din side connects to the ENI module.

The following screen shows the main dialog of the Utility. Specify the ENI series, 232 baud rate, IP address and subnet mask. In our example we used an ENI Series D interface. The baud rate that was configured in the PLC and ENI was set to 19200. The Ethernet Speed/Duplex parameter was set to Auto Negotiate. The IP address for the ENI module was specified as 10.22.6.54.

Select the "Utility Settings" tab. Then select the PC COM port you are connected to. Specify the baud rate.

All other tabs in the ENI Utility were left with default values as screens show below.


After all the parameters are configured as shown in screens above, click "File-Save" to save the configuration to disk for future use. Then upload the new configuration into ENI by clicking on ENI ROM.

Lastly, Disconnect the ENI cable from the PC, and then cycle power to reset the ENI module. Connect the cable between the ENI and the MicroLogix to complete the connections as shown in architecture above.