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Establishing TCP/IP Communication between CPU 417-4 and CPU 551 (TDC)

Establishing TCP/IP communication between a CPU 417-4 and a CPU 551 (TDC) involves configuration on both PLCs. Here's a streamlined approach:

1. IP Address Configuration: Assign unique, static IP addresses to both CPUs within the same subnet. Use TIA Portal to configure this.
2. Network Settings: Verify correct subnet mask and gateway settings in both PLCs.
3. Establish Connection: Use S7 communication (Open Communication) or PUT/GET commands in your TIA Portal project. Configure the connection parameters (IP address, TSAP) correctly.
4. Firewall Considerations: Ensure no firewalls are blocking communication between the PLCs.
5. Testing: Use TIA Portal's online diagnostics to test the connection. A simple PUT/GET test is a good starting point.

Resources:

• Siemens Support - Communication between S7-400 and S7-300/400 via TCP/IP
• Siemens Support - How to establish TCP connection between two S7 PLCs?

For detailed configuration steps and troubleshooting, refer to the TIA Portal documentation and the Siemens Support website. If problems persist, consider opening a support request via SiePortal.