Siemens alarm 810002: Synchronous error, error analysis via STEP7 required
SINUMERIK PLC system alarm · Siemens 840D sl
What it means
A synchronous runtime error occurred in the PLC user program - e.g. access to a non-existent address or a faulty block call - and was reported to the HMI in reduced form as 810002. Synchronous errors occur within the scanned program at the point of the faulty instruction, so STEP 7's diagnostic buffer and stack evaluation identify the exact block/network. The machine stays limited until the programming/hardware cause is corrected.
Likely causes
- Direct address access to non-existent I/O or DB area
- Faulty block call/parameter in OB1 chain
- Area-length error during data access
Triage note: Reduced PLC error message; remedy per Siemens: diagnose with STEP 7.
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