Unlock Potential with CompactLogix 5380 Dual IP Ports
The Allen-Bradley CompactLogix 5380 PLC has two Ethernet ports. This is a powerful feature. It lets you connect the controller to two separate networks. You can keep machine control safe from office network traffic. This guide explains how to use this feature effectively.
Why Use Two Separate Networks?
Mixing all traffic on one network can cause problems.
- Security: Isolate the machine control network. Protect it from unauthorized access or internet threats.
- Performance: Keep time-critical I/O and motion data separate. Prevent delays from large file transfers or updates.
- Reliability: If one network has a problem, the other can keep running. This improves overall system uptime.
Typical Dual Network Setup
- Network 1 (Plant/Control): Connect drives, I/O, HMIs, and other machines. This network needs fast, predictable communication.
- Network 2 (Enterprise/Information): Connect to servers, engineering computers, and cloud systems for data collection and programming.
Key Benefits of This Setup
- No Interruptions: An engineer can download a program to the PLC on Network 2. This will not slow down the high-speed control on Network 1.
- Better Security: You can firewall the Enterprise network from the internet. The control network remains completely isolated inside the factory.
- Easier Troubleshooting: Network problems are easier to find when traffic is separated.
How to Configure the Dual IP Addresses
You set this up in Studio 5000 Logix Designer software.
- Open your controller properties.
- Go to the “Port Configuration” tab.
- Set each Ethernet port to a different IP address and subnet.
- Assign each port to its specific role in your system.
Important Rules and Best Practices
- Use Different Subnets: The two IP addresses must be on different subnets. For example, use 192.168.1.xxx for Port 1 and 10.10.10.xxx for Port 2.
- Use Managed Switches: Connect each port to a separate managed network switch. This gives you more control over the traffic.
- Do Not Bridge the Networks: Never connect a cable between the two switches. This would merge the networks and defeat the purpose.
- Label Everything Clearly: Label all cables and switch ports as “Control” or “Enterprise” to avoid mistakes.
Common Applications
- Packaging Machine: Port 1 connects to servo drives and sensors. Port 2 connects to a factory SCADA system for production reporting.
- Water Treatment Plant: Port 1 runs the local process control. Port 2 sends data to a remote monitoring center over a secure connection.
- Automation Cell: Port 1 talks to robots and safety devices. Port 2 is for the engineering laptop used for maintenance.
Frequently Asked Questions (FAQ)
Configuration Questions
- Can I use both ports for the same control network to get more connections?
No, that is not the intended use. For more connections on one network, use a network switch. The dual IP feature is for separating different types of traffic.
Functionality Questions
- If one network fails, will the controller switch to the other?
No. The ports are independent. If the control network fails, the controller will lose connection to its I/O, even if the enterprise port is still working.
Design Questions
- We only have one physical network. Do we need this feature?
Probably not. The dual IP feature is most valuable when you have a reason to create two logical or physical network segments.
For help designing a robust control network, visit Oiltech Controls Limited.
