PLCS7-1200Verified · sol.ls-electric.com
S7-1200 16#4300 — OB scan time exceeded
Trip — immediate stop
CAUSE
Why does it occur?
- The main cycle (OB
- exceeded the configured cycle monitoring time — suspected infinite loop, communication block, or overloaded code.
REMEDY · Step by step
How to fix it?
Add OB80 (time error), increase the cycle monitoring time, and move heavy communication/computation blocks to a separate OB.
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.
Open official manual ↗CALLBACK