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Asked:18 Oct 2025

LOGO! - Communication: Logic module Towards S7 series 1200 Programmable logic controller Networking Issue

hello!
I am trying to connect my LOGO to S7-1200 but it seems there is a problem on communicating between the 2. LOGO! to be the client. Please help me. Here is the error i got.

#sosflex #LOGO! - Communication #siemens
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Siemens Test Added an Answer on18 Oct 2025
LOGO! to S7-1200 Communication Issue

LOGO! to S7-1200 Communication Troubleshooting

Hello! Connecting a LOGO! as a client to an S7-1200 requires careful configuration. The error you're encountering suggests a communication breakdown. Here's a breakdown of common issues and solutions:

Key Configuration Points

  • LOGO! Configuration: Ensure the LOGO! is configured as a Modbus TCP client with the correct IP address of the S7-1200. Verify the port number (typically 502).
  • S7-1200 Configuration: The S7-1200 must be configured as a Modbus TCP server. This requires using the Modbus TCP server function blocks in your TIA Portal project.
  • Network Connectivity: Confirm both devices are on the same network subnet and can ping each other.
  • Firewall: Check for firewall restrictions on both the LOGO! and S7-1200, and ensure port 502 (or your configured port) is open.

Resources

For detailed guidance, please refer to these Siemens resources:

If the issue persists, please provide the specific error message and details about your LOGO! and S7-1200 configurations for further assistance. You can find more information on SiePortal.

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