PLCS7-1200Verified · sol.ls-electric.com
S7-1200 16#2520 — STOP, defect
Critical — power cycle required
CAUSE
Why does it occur?
A fault detected during internal self-diagnostics — such as memory corruption or ASIC fault.
REMEDY · Step by step
How to fix it?
- Power cycle, then try booting with the memory card removed
- Replace the CPU if it recurs
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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