The Siemens 6ES7 LAN Connection Module is a communication interface module used in SIMATIC S7-300/400 PLC systems for Ethernet-based data exchange. It enables industrial automation devices to connect to Local Area Networks (LANs), facilitating communication with HMIs, SCADA systems, and other PLCs via Industrial Ethernet (PROFINET or TCP/IP).
Key Features of Siemens 6ES7 LAN Modules
✔ Industrial Ethernet Support – PROFINET, TCP/IP, UDP, SNMP.
✔ Fast Data Transfer – Typically 10/100 Mbps (some support Gigabit).
✔ Modular Design – Plugs into S7-300/400 racks.
✔ IP20 Protection – For control cabinet use (not field-rated).
✔ Configuration via STEP 7 – Easy integration with Siemens TIA Portal.
Common Models & Functions
| Model | Description |
|---|---|
| 6ES7 972-0BB12-0xA0 | CP 343-1 Lean (Basic PROFINET IO) |
| 6ES7 972-0CB20-0xA0 | CP 343-1 (Advanced TCP/IP & PROFINET) |
| 6ES7 972-0AA01-0xA0 | CP 343-1 IT (Email, FTP, Web server) |
| 6ES7 972-0BA50-0xA0 | CP 443-1 (S7-400 High-Performance LAN) |
Typical Applications
Machine-to-Machine (M2M) Communication
Remote Monitoring & Control
Data Logging (via FTP/SNMP)
Integration with SCADA & ERP Systems
Wiring & Connection Setup
Physical Connection – RJ45 port (CAT5e/CAT6 cable).
IP Configuration – Set via STEP 7/TIA Portal (static or DHCP).
PROFINET IO Setup – Assign device names using PRONETA or TIA Portal.
Troubleshooting Tips
???? No Link Light? → Check cable, switch port, or module power.
???? IP Conflict? → Verify unique IP in the network.
???? PROFINET Not Detected? → Reassign device name via SIMATIC Manager.
Comparison: CP 343-1 vs. CP 343-1 Lean
| Feature | CP 343-1 | CP 343-1 Lean |
|---|---|---|
| PROFINET IO | ✅ Yes | ❌ No (only controller) |
| TCP/IP Protocols | Full support | Limited |
| Web Server | ✅ Yes | ❌ No |
| Cost | Higher | Lowerhttps://store.unigulfsupply.com/product/siemens-6es7-lan-connection-module/ |