Code 230008: <location>Power unit: Sign-of-life error cyclic data
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Power unit: Sign-of-life error cyclic data alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Message value: Drive object: All objects Reaction: A_INFEED: NONE (OFF1, OFF2) SERVO: NONE (OFF1, OFF2, OFF3) VECTOR: NONE (OFF1, OFF2, OFF3) Acknowledge: IMMEDIATELY Cause: The power unit has detected that the cyclic setpoint telegrams of the Control Unit were not punctually updated for at least two clock cycles within a time interval of 20 ms. Remedy: - check the electrical cabinet design and cable routing for EMC compliance - for projects with the VECTOR drive object, check whether p0117 = 6 has been set on the Control Unit. See also: p0117 (Current controller computing dead time mode)
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 230008 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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