PLCS7-1200Verified · sol.ls-electric.com
S7-1200 16#3501 — Cyclic interrupt error
Alarm — operational, inspection needed
CAUSE
Why does it occur?
A cyclic interrupt OB (e.g., OB30 and up) did not finish within its configured cycle time.
REMEDY · Step by step
How to fix it?
Reduce the execution time of the interrupt OB, increase the cycle setting, and review the priority.
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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