Troubleshooting PLC and NATR Unit Connection Issue

Question:

I have experience configuring NATR units in the past, but I have encountered an issue with one unit specifically. I am wondering if it is feasible to connect it given the current configuration of the PLC. Typically, I would set the gateway of the PLC to match the private side address of the NATR device. However, in this instance, the PLC (1769-L30ER) already has a gateway set up, as it seems to be linked to a network switch of a robot it communicates with. I hope I have explained the problem clearly. Is there a way to establish a connection between this PLC and the NATR unit?

Top Replies

1. The switch has routing capabilities. 2. The switch lacks routing capabilities. Version 1 of your issue can be resolved without the need for NAT by utilizing the switch to direct traffic to the PLC. In Version 2, the gateway is ineffective in its current state; consider changing it as needed. An alternative solution is IP masquerade, which conceals external addresses as internal ones. The 1783-NATR model lacks this feature but offers a "gateway mapping" function that may not work correctly in specific scenarios. For a more efficient and reliable NAT solution, consider Pheonix Contact's FL mGuard series.

Cheeseface mentioned two capabilities of the switch: routing and lack of routing. In version 1, the issue is resolved without the need for NAT by using the switch to route to the PLC. However, in version 2, the gateway is deemed ineffective and can be changed as desired. Another alternative is using IP masquerade to disguise outside addresses as inside addresses. While the 1783-NATR lacks this feature, it offers a "gateway mapping" function that may not work effectively in certain scenarios. Personally, I recommend Pheonix Contact's FL mGuard series as a superior NAT solution. It appears that version 2 was the correct choice, as the gateway was not performing any useful function. Thank you for your assistance!

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Frequently Asked Questions (FAQ)

FAQ: 1. How do I typically configure a connection between a PLC and a NATR unit?

Answer: - Answer: Typically, you would set the gateway of the PLC to match the private side address of the NATR device.

FAQ: 2. What should I do if the PLC already has a gateway set up and is linked to another device?

Answer: - Answer: In such cases, you may need to adjust the network configuration to establish a connection between the PLC and the NATR unit.

FAQ: 3. Is it feasible to connect a NATR unit to a PLC with a preconfigured gateway?

Answer: - Answer: It may be possible to establish a connection by adjusting the network settings and ensuring compatibility between the PLC and the NATR unit.

FAQ: 4. What steps can I take to troubleshoot the connection issue between the PLC and the NATR unit?

Answer: - Answer: You can start by checking the network settings, verifying compatibility, and ensuring proper communication protocols are being used between the PLC and the NATR unit.

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