Code 235232: <location>TM41: Zero mark no longer synchronous and POWER ON required
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>TM41: Zero mark no longer synchronous and POWER ON required 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: TM41 Reaction: NONE Acknowledge: NONE Cause: SINAMICS (p4400 = 1) operating mode: When parameterizing a Terminal Module 41 (TM 41) or when operating a TM41 module, an operating state was reached which required a POWER ON. These include: - changing the encoder pulse number (p0408). - changing the fine resolution (p0418). - withdrawing the DRIVE-CLiQ cable wi thout first deactivating TM41 via p0105. If this alarm was output, then the zero mark of t he TM41 can no longer be output in synchronism to that of the encoder interconnected at p4420. SIMOTION (p4400 = 0) operating mode: A previously set zero mark position (p4426) no longer matches encoder position r0479 due to the change in the pulse number (p0408). Remedy: The incremental position at output X520 of TM41 c an still be evaluated independent of the zero mark. A POWER ON must be carried out if the TM41 zero mark is evaluated.
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 235232 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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