PLCS7-1200Verified · sol.ls-electric.com
S7-1200 16#8104 — Resource not available
Alarm — operational, inspection needed· AUTO-RESET
CAUSE
Why does it occur?
Too many simultaneous communications/instructions — connection slot or resource pool limit exceeded.
REMEDY · Step by step
How to fix it?
Reduce concurrent communications, reuse connections, and disable unnecessary communication blocks.
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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