PLCS7-1200Verified · sol.ls-electric.com
S7-1200 LED-LINK-OFF — PROFINET LINK LED off
Alarm — operational, inspection needed· AUTO-RESET
CAUSE
Why does it occur?
No Ethernet physical link — cable or peer port problem.
REMEDY · Step by step
How to fix it?
Check cable and connector, verify the switch port LED, and try a different port.
Do not reset repeatedly before identifying the cause. Repeated resets while ignoring a trip/alarm can cause secondary damage (IGBT failure, motor winding damage, etc.).
SOURCE
Related manual page
Summary based on the official Siemens AG manual. For accurate and complete information, always consult the official manual.
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