HMISIMATIC HMI KTPVerified · sol.ls-electric.com
SIMATIC HMI KTP 140001 — Online connection lost
Alarm — operational, inspection needed· AUTO-RESET
CAUSE
Why does it occur?
Communication channel with the PLC was lost.
REMEDY · Step by step
How to fix it?
Check Ethernet cable and switch; verify PLC IP, subnet, and routing.
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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